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Miller Edge / Accessory reference

Miller Edge MU21: Sensing-edge profile and configuration selection

MU21 is a sensing-edge profile for commercial sectional doors with a two-inch mounting surface. Its two top tabs wrap around the door edge without a separate mounting channel in the described arrangement. Confirm the door assembly, length, outlet, monitoring and termination requirements for the complete configured edge.

US source scopeUpdated 2026-09-14Independent Anderson reference

Match the whole number.

Manufacturer identifier: MU21. Keep every character when comparing it with your label or paperwork. A similar number does not establish the same component.

Values apply to the exact identifier and scope in the cited source.
Profile applicationCommercial sectional doors with a two-inch surface and appropriate direct mounting.
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Mounting arrangementTwo top tabs wrap around the door edge; no mounting channel is required in the described arrangement.
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Profile width2 inches
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Profile height1-inch sensing body, excluding the mounting tabs
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MaterialsHeavy-duty reinforced PVC.
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Maximum electric-edge length150 feet
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Outlet selectionUniversal, left or right.
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Documented configuration choices2-wire monitored 10K; 2-wire monitored 8.2K; 2-wire monitored diode capacitor; 4-wire monitored; 2-wire non-monitored; Air-Wave non-monitored; Pneumatic non-monitored
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Selection boundaryA profile name does not specify the complete configured edge. Confirm the required length, mounting geometry, outlet, monitored or non-monitored switch configuration, termination and exact operator requirements with Miller Edge. This reference does not establish fitment for every door or opener.
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Source limitationTwo mounting tabs distinguish MU21 from the single-tab MT21 despite the same nominal body dimensions. No replacement relationship is established.
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Source limitationThe tab-height annotation pairs 1-5/8 inches with 114 mm. Do not use that inconsistent conversion to choose mounting clearance.
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Compare the mounting arrangements

Compare the application and mounting details, not just the nominal sensing-body dimensions. Preserve the unresolved source measurements and each configured system's limits.

Separate references with their own source scope. This comparison establishes no replacement or interchangeability.
Exact referenceRecorded distinctions
MT21

Miller Edge MT21: Sensing-edge profile and configuration selection

MT21 is a sensing-edge profile with a single top tab for mounting between the double-angle bottom bars of rolling steel and rolling fire doors. The profile name does not specify a complete configured edge: confirm the door assembly, length, outlet, monitoring and termination requirements.

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  • Profile application: Rolling steel and rolling fire doors; check the individual door assembly requirements.
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  • Mounting arrangement: Single top tab between the double-angle bottom bars.
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  • Profile width: 2 inches
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  • Profile height: 1 inch
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  • Maximum electric-edge length: 150 feet
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  • Source limitation: The MT21 and MT22 URLs returned the same three-profile document. It explicitly identifies MT21, MT22 and MT33; these are three identities, not six records.
    View source and citation details
  • Source limitation: The MT21 and MT22 tab-height annotation pairs 1-5/8 inches with 114 mm. That inconsistent conversion is not used as a selection dimension.
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Read MT21’s pairing status and source conditions →

MU21

This reference

Miller Edge MU21: Sensing-edge profile and configuration selection

MU21 is a sensing-edge profile for commercial sectional doors with a two-inch mounting surface. Its two top tabs wrap around the door edge without a separate mounting channel in the described arrangement. Confirm the door assembly, length, outlet, monitoring and termination requirements for the complete configured edge.

View sources and citation details
  • Profile application: Commercial sectional doors with a two-inch surface and appropriate direct mounting.
    View source and citation details
  • Mounting arrangement: Two top tabs wrap around the door edge; no mounting channel is required in the described arrangement.
    View source and citation details
  • Profile width: 2 inches
    View source and citation details
  • Profile height: 1-inch sensing body, excluding the mounting tabs
    View source and citation details
  • Maximum electric-edge length: 150 feet
    View source and citation details
  • Source limitation: Two mounting tabs distinguish MU21 from the single-tab MT21 despite the same nominal body dimensions. No replacement relationship is established.
    View source and citation details
  • Source limitation: The tab-height annotation pairs 1-5/8 inches with 114 mm. Do not use that inconsistent conversion to choose mounting clearance.
    View source and citation details

Read MU21’s pairing status and source conditions →

A specification absent from one reference is not established by the other. Keep the exact identifier, configuration and cited revision when comparing.

Documented fitment & exclusions

Read the exact equipment or component, market, production and variant limits in every row. An omitted pairing has not been verified by this reference.

A component pairing applies only to the listed items and source conditions. It does not establish suitability for an installed opener or compatibility through another component.

Source statements and their exact conditions. Use the checker below to compare equipment or a component.
Equipment or component / relationshipEvidence and conditions
AW10

Documented compatibility

From MU21 to AW10.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 has an explicitly listed Air-Wave non-monitored option within the source-defined input group for AW10.

Applies only within this source scope
  • Market: US
  • configuration: Air-Wave non-monitored
  • Match the exact Air-Wave non-monitored profile option and its own length limit; the electric-profile length is not the pneumatic or air-wave length. Confirm the installed control and required monitoring with the manufacturer. This is a conditional component-input relationship, not whole-door approval.
  • The wired switch group supports edges up to 60 feet, but a lower limit printed for the exact edge profile takes precedence. Confirm the switch contact and circuit configuration.
AW12A

Documented compatibility

From MU21 to AW12A.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 has an explicitly listed Air-Wave non-monitored option within the source-defined input group for AW12A.

Applies only within this source scope
  • Market: US
  • configuration: Air-Wave non-monitored
  • Match the exact Air-Wave non-monitored profile option and its own length limit; the electric-profile length is not the pneumatic or air-wave length. Confirm the installed control and required monitoring with the manufacturer. This is a conditional component-input relationship, not whole-door approval.
  • The wired switch group supports edges up to 60 feet, but a lower limit printed for the exact edge profile takes precedence. Confirm the switch contact and circuit configuration.
AW14

Documented compatibility

From MU21 to AW14.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 has an explicitly listed Air-Wave non-monitored option within the source-defined input group for AW14.

Applies only within this source scope
  • Market: US
  • configuration: Air-Wave non-monitored
  • Match the exact Air-Wave non-monitored profile option and its own length limit; the electric-profile length is not the pneumatic or air-wave length. Confirm the installed control and required monitoring with the manufacturer. This is a conditional component-input relationship, not whole-door approval.
  • The wired switch group supports edges up to 60 feet, but a lower limit printed for the exact edge profile takes precedence. Confirm the switch contact and circuit configuration.
AW14-RF

Documented compatibility

From MU21 to AW14-RF.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 has an explicitly listed Air-Wave non-monitored option within the source-defined input group for AW14-RF.

Applies only within this source scope
  • Market: US
  • configuration: Air-Wave non-monitored
  • Match the exact Air-Wave non-monitored profile option and its own length limit; the electric-profile length is not the pneumatic or air-wave length. Confirm the installed control and required monitoring with the manufacturer. This is a conditional component-input relationship, not whole-door approval.
  • The radio distance is not an edge-length rating. Use the exact AW14-RF and MRF-01 system, confirm the profile length and resolve the documented receiver supply conflict.
FSC-57-115VAC

Documented compatibility

From MU21 to FSC-57-115VAC.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 is within the exact four-wire Miller Edge input group listed for FSC-57-115VAC.

Applies only within this source scope
  • Market: US
  • configuration: 4-wire monitored
  • Confirm the controller supply, edge circuit, reset requirements and installed door safety function with a qualified designer. This is component-input scope only. This exact model specifies 115 V AC.
  • Miller Edge MU21 sensing edgeMU21_20220607, PDF page 2: Exact four-wire monitored profile option · checked 2026-09-13 · MU21_20220607 · Miller Edge
  • RT6 and FSC-57 safety relay controllersRT6_FSC-57_20211111, PDF page 2: Any model 4-wire Miller Edge sensing edge and model columns · checked 2026-09-14 · RT6_FSC-57_20211111 · Miller Edge
FSC-57-24VDC

Documented compatibility

From MU21 to FSC-57-24VDC.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 is within the exact four-wire Miller Edge input group listed for FSC-57-24VDC.

Applies only within this source scope
  • Market: US
  • configuration: 4-wire monitored
  • Confirm the controller supply, edge circuit, reset requirements and installed door safety function with a qualified designer. This is component-input scope only. The VDC model and first-page list say 24 V DC; the table also says AC. AC acceptance is unresolved.
  • Miller Edge MU21 sensing edgeMU21_20220607, PDF page 2: Exact four-wire monitored profile option · checked 2026-09-13 · MU21_20220607 · Miller Edge
  • RT6 and FSC-57 safety relay controllersRT6_FSC-57_20211111, PDF page 2: Any model 4-wire Miller Edge sensing edge and model columns · checked 2026-09-14 · RT6_FSC-57_20211111 · Miller Edge
FSIS-35P-4

Documented compatibility

From MU21 to FSIS-35P-4.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 is in the explicitly named Miller Edge 2/4-wire sensing-edge input group for FSIS-35P-4.

Applies only within this source scope
  • Market: US
  • configuration: 4-wire monitored
  • Confirm exact input configuration and the full circuit with the responsible qualified designer. The group statement does not approve the edge for a classified location, establish intrinsic safety of the installation, or certify a complete door safety function.
MEL-K20

Documented compatibility

From MU21 to MEL-K20.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • termination
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 falls within the MEL-K20 sheet's explicit T2 (10K) monitored sensing-edge group only with the matching configured termination.

Applies only within this source scope
  • Market: US
  • configuration: 2-wire monitored
  • termination: 10K resistive
  • The source qualifies monitored operation with its UL325-2010 listed commercial door/gate operator context. The specific installed operator still requires confirmation; this group relationship is only the sensing-edge input scope.
  • This does not establish MEL-II or RBand compatibility, present product availability, or an installed-operator approval.
  • Miller Edge MU21 sensing edgeMU21_20220607, PDF page 2: Exact profile monitored 10K membership · checked 2026-09-13 · MU21_20220607 · Miller Edge
  • Monitored Edge Link MEL-K20MEL-K20_Spec_20150303, PDF page 1: Any T2 (10K) monitored edge group and listed-operator condition · checked 2026-09-14 · MEL-K20_Spec_20150303 · Miller Edge
PS20A

Documented compatibility

From MU21 to PS20A.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 has an explicitly listed Pneumatic non-monitored option within the source-defined input group for PS20A.

Applies only within this source scope
  • Market: US
  • configuration: Pneumatic non-monitored
  • Match the exact Pneumatic non-monitored profile option and its own length limit; the electric-profile length is not the pneumatic or air-wave length. Confirm the installed control and required monitoring with the manufacturer. This is a conditional component-input relationship, not whole-door approval.
  • PS20A supports pneumatic configured edges up to 18 feet; any lower profile-specific limit also applies. Match the required contact configuration.
RT6-115VAC

Documented compatibility

From MU21 to RT6-115VAC.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 is within the exact four-wire Miller Edge input group listed for RT6-115VAC.

Applies only within this source scope
  • Market: US
  • configuration: 4-wire monitored
  • Confirm the controller supply, edge circuit, reset requirements and installed door safety function with a qualified designer. This is component-input scope only. This exact model specifies 115 V AC.
  • Miller Edge MU21 sensing edgeMU21_20220607, PDF page 2: Exact four-wire monitored profile option · checked 2026-09-13 · MU21_20220607 · Miller Edge
  • RT6 and FSC-57 safety relay controllersRT6_FSC-57_20211111, PDF page 2: Any model 4-wire Miller Edge sensing edge and model columns · checked 2026-09-14 · RT6_FSC-57_20211111 · Miller Edge
RT6-24VDC

Documented compatibility

From MU21 to RT6-24VDC.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 is within the exact four-wire Miller Edge input group listed for RT6-24VDC.

Applies only within this source scope
  • Market: US
  • configuration: 4-wire monitored
  • Confirm the controller supply, edge circuit, reset requirements and installed door safety function with a qualified designer. This is component-input scope only. The VDC model and first-page list say 24 V DC; the table also says AC. AC acceptance is unresolved.
  • Miller Edge MU21 sensing edgeMU21_20220607, PDF page 2: Exact four-wire monitored profile option · checked 2026-09-13 · MU21_20220607 · Miller Edge
  • RT6 and FSC-57 safety relay controllersRT6_FSC-57_20211111, PDF page 2: Any model 4-wire Miller Edge sensing edge and model columns · checked 2026-09-14 · RT6_FSC-57_20211111 · Miller Edge
SM-101

Documented compatibility

From MU21 to SM-101.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • termination
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 is within the documented Miller Edge sensing-edge group for SM-101 only when configured with the matching two-wire monitored termination.

Applies only within this source scope
  • Market: US
  • configuration: 2-wire monitored
  • termination: Diode capacitor
  • Confirm the exact supplied termination and the installed commercial door operator requirements with Miller Edge. This is an edge-to-module input relationship, not approval of the downstream operator or a complete safety system.
  • Miller Edge MU21 sensing edgeMU21_20220607, PDF page 2: Exact profile monitored configuration membership · checked 2026-09-13 · MU21_20220607 · Miller Edge
  • Signature Module SM-101 and SM-102SM101-SM102_20230407, PDF page 2: Related-products group scope and model-specific input table · checked 2026-09-13 · SM101-SM102_20230407 · Miller Edge
SM-102

Documented compatibility

From MU21 to SM-102.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • configuration
  • termination
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

MU21 is within the documented Miller Edge sensing-edge group for SM-102 only when configured with the matching two-wire monitored termination.

Applies only within this source scope
  • Market: US
  • configuration: 2-wire monitored
  • termination: 10K resistive
  • Confirm the exact supplied termination and the installed commercial door operator requirements with Miller Edge. This is an edge-to-module input relationship, not approval of the downstream operator or a complete safety system.
  • Miller Edge MU21 sensing edgeMU21_20220607, PDF page 2: Exact profile monitored configuration membership · checked 2026-09-13 · MU21_20220607 · Miller Edge
  • Signature Module SM-101 and SM-102SM101-SM102_20230407, PDF page 2: Related-products group scope and model-specific input table · checked 2026-09-13 · SM101-SM102_20230407 · Miller Edge

Direct replacement paths

No direct successor for MU21 is verified in this reference.

A direct replacement statement does not establish reverse interchangeability, a kit equivalent or a later replacement chain.

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Selected: MU21 · Read its reference. Selection identifies a record; it does not confirm fitment.

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An accessory pairing, including a receiver or wall console, applies only to the exact listed pair and source conditions. It does not establish suitability for your installed opener or compatibility through another device.

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Recall references

No recall reference is included for this identifier in the published dataset. This is not a safety clearance or proof that no recall exists.

Sources & scope

  1. AW10, AW12A and AW14 wired air-wave switchesMiller Edge · US · checked 2026-09-14 · AW101214_20210223
  2. AW14-RF-K10 wireless air-wave edge systemMiller Edge · US · checked 2026-09-14 · AW14RF_20210101
  3. FSIS-35P-4 intrinsically safe relay controllerMiller Edge · US · checked 2026-09-14 · FSIS-35P-4_20211111
  4. Monitored Edge Link MEL-K20Miller Edge · US · checked 2026-09-14 · MEL-K20_Spec_20150303
  5. Miller Edge MU21 sensing edgeMiller Edge · US · checked 2026-09-13 · MU21_20220607
  6. PS20A pneumatic switch and wired kit selectionMiller Edge · US · checked 2026-09-14 · PS20A_20210101
  7. PS20A and PS20-RF pneumatic systems and exact kit optionsMiller Edge · US · checked 2026-09-14 · PS20A20RF_Spec_20141208
  8. RT6 and FSC-57 safety relay controllersMiller Edge · US · checked 2026-09-14 · RT6_FSC-57_20211111
  9. Signature Module SM-101 and SM-102Miller Edge · US · checked 2026-09-13 · SM101-SM102_20230407

Anderson prepared this reference from the listed evidence. Source statements are not an Anderson installation inspection or independent product test. Official documents stay on their publisher’s website.

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