LiftMaster LM56A Proximity Reed Switch

Overhead Door Proximity Reed Switch for Dock Monitoring

The LiftMaster LM56A Proximity Reed Switch is a normally open, magnetic sealed reed switch assembly used to monitor overhead door position and related dock equipment status. It is commonly used to confirm whether a dock leveler is deployed or a truck restraint is engaged, supporting productivity and status tracking when paired with myQ Dock Management.

Key Features

• Normally open magnetic reed switch contact for overhead door monitoring
• Fixed magnet design for consistent door position sensing
• Rugged construction intended for high-traffic dock and industrial door environments
• Stainless steel armored cable helps protect wiring in demanding installs
• Hermetically sealed reed switch design
• Requires Dock Door Operator model DDO8900W with the LMi5 Interface Device (for myQ Dock Management use)

Technical Specifications

• Contact Type: Form A (N.O.)
• Contact Rating: 10VA
• Max Carry Current: 2 A
• Max Switching Current: 0.5 A
• Breakdown Voltage: 250 VDC
• Operating Gap: 2 in
• Cable: 24 in stainless steel armored cable
• Leads: 22 AWG, 24 in leads
• Temperature Range: -40°F to 257°F (-40°C to 125°C)
• Listings: UL and ULC listed
• Also Known As: ODC-56 (Potter Amseco)

Conclusion

The LiftMaster LM56A is a purpose-built proximity reed switch solution for overhead door and dock monitoring where durable construction, consistent sensing, and protected wiring matter. Elite recommends confirming application requirements and interface dependencies before ordering to ensure proper system operation.