Safety Relays

What is a safety relay?

A safety relay monitors safety-related signals and ensures safe shutdown in the event of danger to protect people and machines. They monitor the function of connected safety sensors and wiring and act as power amplifiers to safely switch off connected contactors or drives. They are designed to detect malfunctions in devices, sensors, or actuators and, if necessary, to initiate the safe shutdown of machines or systems. The safety relay module detects the input of the safety signal, simultaneously checks the activation of the start switch in the control system, and then sends a signal to the contactor to start motor operation.

What are the features and functions of safety relays?

• Forced-guided contacts: Insulated contacts guarantee reliable fault detection in the device.
• Comprehensive diagnostics: Detects defects in sensors, actuators, and wiring for maximum safety.
• Tested quality: Certified worldwide by TÜV, UL, GL, and CCC.

What are the areas of application for safety relays?

Safety relays are primarily used to monitor safety functions in the following areas, for example:

• Metalworking: The relay ensures that the press only starts when the worker has both hands on the buttons and cannot reach under the tool.
• Food industry: If someone opens the safety door on the packaging machine, the safety relay immediately switches off the motor so that no one is injured.
• Logistics & warehousing: As soon as someone pulls the emergency stop cord on a long conveyor belt, the relay stops the belt immediately to prevent accidents.
• Firing systems: The device monitors the gas burner in continuous operation and immediately shuts off the gas if a fault occurs in the line or at the flame.

No matter in which industry they are needed: We have the right safety relays, safety controller, safety time relays, safe coupling relays and extension modules. 

	Type	Safety contacts /outputs (NO)	Auxilliary contacts / outputs (NC)	1 / 2 channel wiring	Width in mm	Approvals	Applications
Safety Relay	SR2C	2		1/2	22,5	CE, TÜV, cULus, CCC
	SR3C	3	1	1/2	22,5	CE, TÜV, DNV GL, cULus, CCC
	SR7C	7	6	1/2	45	CE, TÜV, CCC, cULus
	SR3A	3	1	1/2	22,5	CE, TÜV, CCC, cULus
	S2HC	2 (2.Hand)		1/2	22,5	CE, TÜV, cULus, CCC
	SR3E	3	1	1/2	22,5	CE, TÜV, CCC, cULus
	SR3D	3	1	1/2	22,5	CE, TÜV, DNV GL, cULus, CCC
	SR3AD	3	1	1/2	22,5	CE, TÜV, CCC, cULus
	TETHYS IP65 SR	3	1/1	1/2	86,4	CE, TÜV, cULus pending
Safe Coupling Relays	SR7D	7	6	1/2	45	CE, TÜV, CCC, cULus
	SK3D	3	1	1/2	22,5	CE, TÜV, CCC, DNV GL, cULus
Safety Timer	SR4C	4		1/2	22,5	CE, TÜV, cULus, CCC
	SCB-04	2S / 2PNP	2PNP	1/2	22,5	CE, TÜV, cULus
	SCB-03	3PNP	2PNP	1/2	22,5	CE, TÜV, cULus
	SCB-02	2S	2PNP	1/2	22,5	CE, TÜV, cULus
Extension modules	SREC	3	1	1/2	22,5	CE, TÜV, cULus, CCC
	SRTC	3	3	1/2	22,5	CE, TÜV, cULus, CCC

The SR4C safe time relays are available in several combinations of delayed / undelayed contacts.