Auxiliary contacts Auxiliary contact blocks are conveniently fitted into an auxiliary-device compartment, accessible by removing the breaker cover. This fully insulated compartment has several pouches, a number of which are reserved for contact blocks. To allow for a logical and traceable schematics each contact block has a pre-defined position within the auxiliary device compartment indicated by a symbol printed both on the breaker case and on the auxiliary device itself. External wiring can be brought into the accessory compartment through - specifically designed and positioned - break-out openings in the breaker lid or can go through channels in the breaker rear. Once this is done the wiring can be stripped an easily connected to the box terminals on the internal accessories. These terminals are designed to connect wiring up to 2,5 mm². To identify the correct mounting position within the accessory compartment symbols are moulded into the breaker and contact housing. For auxiliary switches suited for mounting on the right and on the left. For Bell alarm switches; Mechanism operated types and Trip unit operated types.