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8.4 Relay for two-hand control using mechanical switches
with simultaneity monitoring
Two-hand control with mechanical switches / safety relay for mechanical switches
or 2-channel fail-safe sensors/switches with contact output with simultaneity
monitoring�
The contacts of the mechanical switches must allow a minimum current of
6 mA�
8.4.1 Connection
Connection of two mechanical fail-safe switches
This wiring (with only one normally open contact per sensor/switch) meets the
requirements of type IIIB to EN 574�
Use up to type IIIC is possible using corresponding sensors/switches approved to
EN 60947-5-1 annex K and protected or screened wires�
G1502S
1: Mechanical fail-safe switch 1
2: Mechanical fail-safe switch 2
