Switches, Relays & Keypads


Force guided relays

1 May 2013 Switches, Relays & Keypads

Force guided relays are key electromechanical switching components used within safety relay circuits. They enable the recognition of a contact’s switching condition in a simple and safe manner.

With the normally open (NO) and normally closed (NC) contacts of a force guided relay being insulated from each other, the load and monitoring circuit may have different voltage potentials. This simplifies monitoring, as the same relay can switch line voltage with one set of contacts and switch a DC signal to the microprocessor with another.

Force guided relays are designed to switch outputs of safe PLCs (programmable logic controllers) for automation and control, to monitor railway signals, to provide information related to the opening of an elevator door, and for use in monitoring machines and processes.

The specific details entitling force guided relays to monitor a switching state safely are described by EN 50205. By this, force guided relays can be used to achieve the required functional safety level by applying the highest diagnostic coverage according to IEC 61508-2. In most markets, if relays are used for safe monitoring, they must be force guided relays according to EN 50205.

TE Connectivity’s relay products division offers the SR2M, SR4M and SR6 two-, four- and six-pole models for such applications. Small in size, they are offered with PCB terminals and special types and modules are available.

For more information contact Electrocomp, +27 (0)11 458 9000, andrew@electrocomp.co.za, www.electrocomp.co.za



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