States' FMS test switches offer safe and secure access to current and voltage sensing circuits

The latest type FMS test switches from States are a well-suited choice for applications where safe and secure access to current and voltage sensing circuits is essential. The switches allow convenient access to the current and voltage inputs of electromechanical, solid-state and microprocessor-based protective relays for direct injection testing.

FMS switches were developed for use in testing applications, and are arranged to allow safe convenient front access test instrument connection.

Connections may be made using States' dual circuit plugs, standard test clips or ABB/Westinghouse test plugs. Connection to the rear of the switches is normally by means of screw terminals, but stud connections are available as an option.

FMS switches can be supplied as standard 10-, 14- or 30-pole assemblies to suit most applications. Virtually any custom switch configuration can be provided. Individual switches are available in voltage and current versions, with the current versions incorporating a make-before-break short-circuit feature to ensure safe operation.

The switches are knife-blade type. Individual switches are separated by insulated barriers that form part of the molded base. The switch handles’ dovetail construction accepts marker cards for circuit identification. The handles are also provided with holes for inserting a yoke bar to gang adjacent switch poles.

In applications where enhanced security is required, States FMS test switches can be fitted with deep, wide, clear covers that incorporate a knockout tab for use with the optional FMS lockout kit. The cover retaining screws also have a hole for use with a meter-type seals to deter unauthorized access.

States type FMS test switches are UL recognized, UL File E225664, with a rating of 600 V, 30A. They are also CSA certified, Certificate 1281976.

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