SDC MSB550 Series Mechanical Switch Bars
Reliable Egress Release for Electromagnetic Door Locks
The SDC MSB550 Series Mechanical Switch Bars provide a reliable, economical solution for releasing electromagnetic door locks to allow uninhibited egress through access-controlled doors. Designed to support egress requirements, these mechanical switch bars activate with slight pressure, triggering a microswitch that immediately releases the electromagnetic lock for quick, quiet, and convenient exit.
Built for demanding commercial applications, the MSB550 Series features heavy-duty aluminum extrusion, metal end caps, and an all-metal mounting assembly with no plastic components. Its rigid construction helps maintain reliable operation on high-traffic doors, including installations where door sagging, warping, or glass door stile movement may affect other exit devices.
With only 1/8-inch total bar movement, the MSB550 delivers fast, quiet activation in a narrow, low-profile design. It is an excellent alternative to sensor-activated exit bars for commercial buildings, access-controlled openings, and other applications requiring dependable mechanical egress release.
Key Features
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Fast Egress Release: Slight pressure activates the microswitch to release electromagnetic door locks.
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Minimal Bar Movement: Only 1/8-inch total movement for quick, responsive operation.
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Heavy-Duty Construction: Durable aluminum extrusion with metal end caps and an all-metal mounting assembly.
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Reliable Performance: Rigid construction helps prevent malfunctions caused by sagging or warped doors and misaligned glass door stiles.
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Quick and Quiet Operation: Provides smooth, quiet activation in high-traffic environments.
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Narrow, Low-Profile Design: Suitable for applications where a streamlined mechanical switch bar is preferred.
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Easy Installation and Troubleshooting: Designed for straightforward installation and maintenance.
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Power Transfer Loop Included: Supplied with a PT-2U power transfer loop.
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Optional Dual-Switch Functionality: Select models provide an additional switch for redundant dual-failsafe operation, alarm shunting, or monitoring output.
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Optional Weather Resistance: The MSB550-2W features water-sealed switches for outdoor applications.
Available Models
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MSB550: Mechanical Switch Bar with one output.
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MSB550-2: Dual Mechanical Switch Bar with an additional switch for redundant operation, alarm shunting, or monitoring.
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MSB550-2W: Weatherized Dual Mechanical Switch Bar with water-sealed switches for outdoor use.
Applications
The SDC MSB550 Series is ideal for:
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Commercial office buildings
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Access-controlled entry and exit doors
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Electromagnetic lock release systems
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High-traffic commercial facilities
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Glass doors and storefront entrances
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Institutional and industrial buildings
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Outdoor access-controlled openings when using the MSB550-2W
Specifications
| Feature | Description |
|---|---|
| Product Series | SDC MSB550 |
| Product Type | Mechanical Switch Bar |
| Activation | Pressure-actuated microswitch |
| Total Bar Movement | 1/8 inch |
| Construction | Heavy-duty aluminum extrusion |
| End Caps | Metal |
| Mounting Assembly | All-metal construction |
| Standard Output | One output |
| Included Accessory | PT-2U power transfer loop |
| Dual-Switch Options | MSB550-2 and MSB550-2W |
| Weatherized Option | MSB550-2W |
| Operation | Quick and quiet |
Choose SDC MSB550 Mechanical Switch Bars
Improve egress reliability and electromagnetic lock release performance with the SDC MSB550 Series Mechanical Switch Bars. With durable metal construction, minimal activation movement, and optional dual-switch and weatherized configurations, this series offers a dependable solution for commercial access control systems that require simple, effective mechanical exit activation.
Shop US Lock Supply for SDC access control hardware and commercial door security solutions.