Fuse disconnect switch H 22 SEA

medium-voltage3-poleAC

Type H 22 SEA are available with earthing switchesintegrated in the switch frame.A positive mechanical locking between load-breakswitch and earthing switch is possible.The earthing switches generally have short-circuitmaking capacity and are therefore make-proof.Release coils or shunt releases (110 V, 230 V AC, or24 V, 60 V, 110 V, 220 V DC) can only be mountedon switches with trip-free mechanism (not H 22 EK),signalling contacts can be mounted on all switchesincluding earthing switches.All H 22 SEA switches are available with mechanicalrelease delay (retarding) as per EN 62271-105.This feature provides an economical solution for thecontinuous protection of local network transformersthrough the HV HBC fuse on the high voltage side,this normally being implemented by a circuit breaker.Buchholz protector or thermal relay can also be provided with the load-break switch as additional protection measures.The actuation of the load-break switch H 22 can becarried out with a linkage system operated by a leveror with a motor-operated mechanism according toList 774.