The 15.0017-21 is a Safety Socket with silver-plated brass contacts. The KBT6AR-N/10-S safety sockets are sockets with locking devices and for crimping onto highly flexible copper conductor. This safety socket is suitable for mating with either safety flush-mounting plugs or KST6AR-N series plugs. Used together with a flush-mounting plug it acts as an appliance connector and with plugs as a coupler. KBT6AR-N/10-S and ID/S6AR-N-S connections with snap-in lock for a motor/generator in a vocational school.