System Sensor M500R — addressable 500 Series relay control module with two isolated Form-C contacts.
Installers reach for the M500R when the panel must operate something that is not a notification appliance: door holders, elevator recall inputs, HVAC and damper control. It neither powers nor supervises the circuit it switches, so it suits loads whose wiring need not be supervised.
- Normal operating voltage 15 to 32 VDC
- Maximum current draw 6.5 mA (LED on); average 230 µA direct poll
- Two isolated Form-C contact sets operating as a DPDT switch
- Contacts rated 3 A @ 30 VDC resistive non-coded, 2 A @ 30 VDC resistive coded
- 4.675" H × 4.275" W × 1.4" D; mounts to a 4" square box of 2 1/8" minimum depth
The box is supplied by the installer; the SMB500 surface box and CB500 barrier are separate part numbers, and the CB500 is required wherever wiring on terminals 4–10 is non-power-limited. Contacts can transfer in shipping, so make the module communicate with the panel before connecting controlled circuits.
Documents
FAQ
Can the M500R replace an M500C?
Yes. System Sensor states it can replace an M500C module that has been configured for Form-C operation.
What box does it mount to?
A 4 in. square electrical box at least 2-1/8 in. deep; System Sensor offers the SMB500-WH surface box, and the module can also mount in the DNR(W) duct housing.
Are the relay contacts supervised?
No. Circuit connections to the relay contacts are not supervised by the module.
Does it need an end-of-line resistor?
No. The installation instructions list EOL resistance as not used.
