Safety Relays Summary

First of all, we would recommend the selection of one of our latest universal relays in the RT-series. These are both practical and cost effective. To facilitate the choice of safety relay or combinations of safety relays, please see:

the table below dividing the safety relays into application fields
the table below showing possible input and output options
the relevant data sheet giving comprehensive information about each specific safety relay
the circuit diagram for various applications are located in ‘Connection Examples'

Note: All earlier type of relays that can now be replaced by those in this manual are still kept as stock items and can be supplied upon request.

Application Fields

Safety Relays

Safety Timers

Expansion Relays

Interlocking Switch/Gate/Hatch

Light Curtains

Light Beams

Safety Mats

Contact Strips

Two-Hand Control Device

Emergency Stop

Hold to Run/Enabling Device

Foot Control Device

Area Supervision

Time Resetting

Time Bypassing

Inching

Output Expansion

Delayed Output

Input Alternatives

Single-Channel, 1 NO from +24V Safety Category 1

The input must be closed before the outputs can be activated. A stop signal is given when the input is opened.

Two-channel, 2 NO from +24V Safety Category 3

Both the inputs must be closed before the outputs can be activated. A stop signal is given if one or both of the inputs are opened. Both the inputs must be opened and reclosed before the outputs can be reactivated. A shortcircuit between the inputs is not monitored by the safety relay. Category 4 can only be achieved if a safety device with short circuit monitored outputs is connected.

Two-Channel, 1 NO & 1 NC from +24 V Safety Category 4

One input must be closed and one must be opened before the outputs can be activated. A stop signal is given if one or both of the inputs change position or if the inputs short-circuit. Both inputs must be put into their initial position before the outputs can be reactivated.

Two-Channel, 1 NO from 0 V & 1 NO from +24 V Safety Category 4

Both the inputs must be closed before the outputs can be activated. A stop signal is given if one or both of the inputs are opened. Both the inputs must be opened and reclosed before the outputs can be reactivated. Stop signal is given if there is a short-circuit between the inputs.

Technical Data * indicates the possibility of selecting delayed outputs / indicates one relay contact per output (other relays having two contacts per output) ‡ delayed º category 4 depending on connection (see Pluto Safety PLC) † fixed 0.5 s delay	Safety Relays										Safety Timers		Expansion Relays

Safety Category	1-4	1-4	1-4	1-4	4	4	1-4º	1-4º	1-4º	1-4º	1-4	1-4	1-4	1-4	1-4	1-3
Safety Input
Single-Channel, 1 NO from +24 V
Two-Channel, 2 NO from +24 V
Two-Channel, 1 NO & 1 NC from +24 V
Two-Channel, 1 NO from 0 V & 1 NO from + 24 V
Contact Strips/Safety Mats
Reset & Test Input
Monitored Manual
Automatic/Unmonitored Manual
Testing of Contactors, Relays, Valves, etc.
Output
NO	3	2	2	7	3	3			3	4			4*	4*	4*
NO Delayed		2					3	4					4*	4*		2/
NO Impulse Outputs											2/	2/
NC	1	1		2	1	1			1					1*	1
NC Delayed							1							1*
Information Output	2	3	1				1	1
Switching Capacity (Resistive Load)
6A/250VAC/1500VA/150W	4	3	2	9	4	4	4‡	4‡	4	4			4	5
4A/250VAC/1000VA/100W											2/	2/				2/
6A/250VAC/1380VA/138W		2‡
10A/250VAC/1840VA/192W															5
Width (mm)	45	45	22.5	100	45	45	22.5	22.5	22.5	22.5	45	45	22.5	45	45	22.5

Contact Strips & Safety Mats Safety Category 1

For an unpressurized mat/strip, both the relay inputs must be closed for the outputs to be activated. In the ease of an activated mat/strip and short-circuit input hannels, the relay will be de-energized. Current limitation prevents the safety relay from being overloaded then the channels short-circuit.

Monitored Manual Reset

A monitored reset means that the safety relay will not be reset if the reset button gets jammed when pressed in or if the input short-circuits. In order for the resetting to be complete, the input must be closed and opened before the outputs can close.

Automatic Reset

Automatic reset means that the outputs are closed immediately when both the input conditions are satisfied and the test input is closed.

Testing of Contactors, Relays & Valves

Can be carried out with both automatic and manual reset.

Note: If serial contacts are connected to the input the Safety Category is made lower for two-channel connections. Safety Category only refers to the safety relay configuration, input devices, output devices and wiring must be considered for a safety category of the system.

©2009 JOKAB SAFETY North America ISO 9001: 2008 CERTIFIED 1- 888- 282- 2123
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