Miller Sensing Edge MU21

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Product Price: $123.29
The Miller Sensing Edge MU21 is a powerful safety solution designed to enhance the functionality and security of various applications. With three standard models available - MU21, MU22, and MU33 - this sensing edge product line offers versatility and reliability for commercial sectional doors, aircraft hangar doors, and material handling systems.

Crafted with precision, the MU21 sensing edge features a compact size of 2”W x 1”H, making it ideal for 2-3 inch thick surfaces. The edges are custom-manufactured to meet user specifications, offering flexibility in color, length, and outlet location. Whether mounted vertically or horizontally, the MU sensing edge delivers exceptional performance.

Built to withstand rigorous conditions, the sensing edge switch is encased in a durable vinyl jacket that ensures longevity and resilience. Its flexible design allows it to conform to floor irregularities, while the top tabs securely wrap around the leading edge of sectional doors for seamless integration.

Key features of the Miller Sensing Edge MU21 include extended color options, such as the yellow chemical-resistant XR5 jacket, and patented Alumaglas™ technology for superior electric performance. Additionally, the sealed assembly is impervious to dust and debris, providing uninterrupted operation.

For added peace of mind, the MU21 comes with a 1-year warranty and is proudly made in the USA. Recognized as a UL 325 Component, this sensing edge is a trusted safety solution for modern operators.

Enhance safety and efficiency with the Miller Sensing Edge MU21, a reliable choice for a wide range of applications. Upgrade your security measures with this premium product designed to meet the highest standards of quality and performance.

The MU sensing edge product line consists of three standard models: MU21  (2”W x 1”H), MU22 (2”W x 2”H), and MU33 (3”W x 3”H). When touched lightly, the sensing edge will send an immediate signal to operator controls to stop and/ or reverse door operation. The MU edge switch is covered in durable vinyl jacket, and its flexibility allows it to conform to floor irregularities. The top tabs wrap around the leading edge of a sectional door. 

APPLICATIONS Commercial sectional doors · Aircraft hangar doors · Material handling systems

FEATURES · Optimum size for 2-3 inch thick surfaces · Custom manufactured to user specifications  for color, length, and outlet location · Mounts vertically or horizontally · Three standard models: MU21 (2”W x 1”H),  MU22 (2”W x 2”H), MU33 (3”W x 3”H) · 5-6 inch end flaps create a complete seal and can be trimmed for custom fit · Extended color options including yellow chemical resistant XR5 jacket · Flexible and will conform to floor irregularities · Sealed assembly impervious to dust and debris · Patented Alumaglas™ for superior performance (electric option) · UL 325 Recognized  Component · 1-year warranty · Made in USA





Monitored Devices Guidelines  For UL325 Listed Operators Built After August 29th, 2010 that have a Monitored Circuit
For older units Prior and other applications in most cases a Non Monitored edge is used

Please confirm with manufacture before ordering as edges are all edges are custom made and Not returnable


Monitored Sensing Edge Designator

T1  is a 8.2K Ohm Resistor Green Color Code    Typically used for European Operators


T2 is a 10K Ohm Resistor Blue Color Code Typically used by the Following Manufactures

Cornell / US Gear,  Liftmaster / Chamberlain,  Linear,  Manaras,  Micanan / Napoleon Lynx,

Raynor,  VE Power Door,  Cookson,, Lawrence


T3  Diode Capacitor  Red Color Code  Used for Overhead Door Corporation units


T4  Capacitor  White Color Code for Linear (Transmitter)


T5  6.8K Ohm Resistor  Orange Color Code   Custom Applications

T6  270K Ohm Resistor Violet Color Code Liftmaster CPS Board 


Complete Ordering Guide for Monitored Openers (Click Here)