Kidde - Edwards 503A Contactor Closed When Depressed

Product Description

The KIDDE - EDWARDS 503A is a normally open contactor that closes the circuit when the actuator is depressed. This type of contact device is used in fire alarm and life safety systems to signal a triggered or activated state. When pressure is applied to the actuator, the internal contacts close and complete the circuit, sending a signal downstream to the connected fire alarm control panel or auxiliary device. Installation is typically performed by licensed fire alarm technicians as part of a larger detection or suppression control system.

The 503A is designed for use as a fire accessory within fire alarm and life safety control systems. It is suited for applications where a momentary or sustained mechanical input needs to generate an electrical signal. Typical installations include manual stations, pull stations, and ancillary control devices within commercial and residential fire alarm infrastructure. No specific compatible model numbers or system families were provided in the available product data.

Key Features

• Contacts close upon depression of the actuator, providing a reliable circuit-completion signal
• Designed for integration into fire alarm and life safety control systems
• Single-unit packaging supports straightforward replacement or new installation
• Compact contactor form factor fits standard fire accessory mounting configurations

Compatibility

Designed as an OEM-style replacement contactor for fire alarm accessory applications where a normally open, closes-when-depressed contact mechanism is required.

Installation Notes

Installation should be performed by a qualified fire alarm technician in accordance with NFPA 72 and applicable local codes. De-energize and isolate the fire alarm circuit before servicing any contactor or contact device. Verify polarity and circuit supervision requirements at the control panel before reconnecting. Do not bypass or defeat any supervisory circuit during installation.