Door Strike Relay Wiring - Honeywell PRO42R1 Installations And Specifications

Door Strike Relay Wiring

The PRO42R1 has two Form-C contact relays for controlling a door strike or other
devices. See specifications section for the relay contact ratings. Load switching
can cause abnormal contact wear and premature contact failure. Switching of
inductive loads (strike) also causes EMI (electromagnetic interference) which may
interfere with normal operation of other equipment. To minimize premature con-
tact failure and to increase system reliability, use the contact protection circuit
shown below. Recommend the following circuit. Locate the protection circuit as
close to the load as possible (within 12 inches [30 cm]), as the effectiveness of the
circuit will decrease if it is located far away.
4 PRO42R1 Installation Guide, Document 800-26500