In types H 22 EK and EA the earthing switch is mounted above or below, on the switch frame (retrofitting ispossible).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.