Abstract: Relays and similar devices are tested by applying electric power to the coil to actuate the armature, measuring armature travel and comparing the measured travel to a datum to produce a percentage relationship. Datum values for the armature travel required to actuate each contact are connected by this produced percentage relationship to produce new datum values for each contact. The armature travel at actuation of each contact is measured and compared to the new or connected datum values. Output signals are desired for the actuation of each contact indicative of the relationship between actual actuation travel and the new datum values.

Abstract: A loading coil assembly comprises a casing with an end disc at the inlet end which carries a central column extending axially in the casing. At the end of the column remote from the inlet end a support member is mounted, and a plurality of magazines, each holding a number of coils, hangs from the support member. Additional support members in the form of rings can be mounted on the column, with further magazines hanging from the rings, in one or more circles. The size of casing varies with the number of support members and rings of magazines. The casing is closed by a further end disc and filled with an expanded plastic material. A plastic material outer casing is applied over the casing.