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INT-04 Series

Emergency-Stop Safety Relay



  • Monitors both contact on E-stop buttons

  • Incorporates loop break detection for floor mat sensing

  • Provides 2 safe outputs plus a form C output for signaling

  • Inhibits machine restart in case of component failure

  • DIN Rail or panel mount

  • LED power on indicator

The INT-04-024 or INT-04-120 Safety Relay is intended for use as a part of a safety circuit in emergency-stop of safety floor mat sensing applications.  It is a safety relay which used positive-guided relays, configured for self-checking, to inhibit machine start-up in the event of an internal component failure.

The INT-04 Relay can also monitor contracts on external relays for controlling expansion block relays (INT-05 and INT-06).

As E-Stop Relay
Both contacts on E-stop buttons are monitored to ensure both have opened and closed to allow machine restart.  Multiple contacts can be wired in series.  Upon failure of either contact, the relay will prevent restart.

As Safety Floor Mat Relay
The INT-04 monitors both loops of a safety floor mat.  The safety outputs of the INT-04 turn off when an operator steps on the mat.   The relay incorporates loop break detection to turn off if one of the loops breaks or becomes disconnected.


INT-04 Series

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Catalog Numbers

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Catalog Number

Emergency-Stop Relay 24VDC
Input: 24VDC, Safe Outputs: 2 N.O., Aux. Output: SPDT


Emergency-Stop Relay 120VAC
Input: 120VAC, Safe Outputs: 2 N.O., Aux. Output: SPDT




Agency Approvals

cULus Recognized (E57361)


Control Inputs (X1, X2 & Y1, Y2 terminals)
Open-circuit voltage = 24VDC
Closed-circuit current = 24mA resistance = 30 Ohms
Simultaneity = 500 ms typical

Safe Outputs (A,B/C,D terminals)
Voltage = 230 VAC/60VDC
Current = 4A (resistive)
Response time = < 100 ms
Fuse = 4A, 250V, 5 x 20 mm, F/T

AUX. Signaling Outputs (E,F,G terminals)
Voltage = 120 VAC/30VDC
Current = 1A (resistive)

Note: Transient protection is required across the load when switching an inductive load.


E-Stop:  The INT-04 energizes after E-stop button contacts are closed and RESET button is pressed (monitored contacts must also be closed).

Floor Mat:  The 2 floor mat loops connect from terminal X1 to X2 and Y1 to Y2.  The INT-04 energizes after RESET button is pressed with no object on mat.  It turns off when a heavy enough object operator is on mat.