DC Voltage/Current Input Limit Alarm 361A 461A

The 361A 461A accept 0 to 20 mA DC, 0 to 100V DC and AC Current with optional sensor input. They provide a single or dual mechanical relay output using 10-36V DC or 115/230V AC Power. They have a 100% adjustable set-point to allow for hi/lo fail safe operation, jumper selectable voltage/current input.

361A: DC-powered

461A: AC-powered

Acromag’s 361A 461A is a DC Voltage/Current Input Limit Alarm Module.

Firstly, these alarms accept DC voltage/current input signals and provide relay output if the input exceeds user-defined set-point limits.

Secondly, features make these alarms easy to use and well-suited for a wide range of limit monitoring and on/off controller applications. Three-way isolation eliminates ground loops to simplify installation. And for easier use in the field, these alarms withstand extreme temperatures. Plus, have accessible set-point voltage test points. Other features include alarm/power status LEDs and independent set-point and dead band adjustment pots.


Input Ranges:

  • 0 to 20mA DC
  • 0 to 1V, 0 to 5V, 0 to 10V, 0 to 50V, 0 to 100V DC
  • With external AC Current Sensor 0 to 20A AC


Electromechanical SPDT dry contact sealed relays; CSA rated for 5A

Power Requirements:

361A: 10 to 36V DC (0.9W max.)

461A: 115V AC (0.0320A) or 230V AC (0.016A)


Features of the DC Voltage/Current Input Limit Alarm 361A 461A include:

  • 100% adjustable set-point via 15-turn pot handles more applications and provides better resolution
  • 100% adjustable dead band via 15-turn pot prevents false trips and eliminates alarm chatter
  • Set-point test points are accessible on front of unit for quick verification with digital voltmeter probe
  • Dual relays offer the flexibility of high/low, high/high, or low/low alarm set-point operation
  • Three-way isolation eliminates ground loops
  • Jumper-selectable DC voltage or current input reduces inventory stock
  • Jumper-selectable fail-safe operation enables alarm actuation on power loss in critical applications
  • Wide power supply range (361A) handles more applications to reduce inventory stock
  • DC power units (361A only) carry lower voltages and do not require expensive conduit for safer and easier installation
  • Diode-coupled power (361A only) supports the use of redundant power supplies for critical applications
  • Excellent accuracy, stability and no loose internal wiring ensure reliable alarm trips
  • Operating temperature range: -25°C to 75°C
  • DIN rail G or T mount
  • No certification/approval required


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