Abstract: The invention features a method and device for introducing fluid material into a climate control system. The fluid material can include a lubricant or a leak detection additive. The device includes a housing having an exit orifice and a housing holder having a trigger. Multiple doses of fluid material can be delivered to systems using the same housing. The method and device can allow a user to provide more economical, faster and cleaner service than with smaller volume systems, because, for example, less time is used to change the housing, eliminating or reducing contact with the fluid material and contamination of the work environment with the fluid material. The housing holder is compact and lightweight due to the absence of an external support structure holding the housing.

Abstract: A residual current circuit breaker 1 has a partition wall 3 which separates an over-current protection device 4 from a residual current detection circuit 5. A plunger rod 24 extends through a bore 23 in the armature 21 of a coil 20 and is moved independently through the coil 20 to trip the breaker if a residual current is detected by the circuit 5. The plunger rod 24 is moved by a drive rod 31, the operation of which is controlled by a permanent magnet which retains the drive rod 31 retracted and an electromagnet which allows the drive rod 31 to drive forwardly under the action of a spring 32 in the event of a residual current being detected. The plunger rod 30 is reset by a reset lever 40 which is moved when an operating handle 18 of the breaker moves from a non-tripped to a tripped position on tripping of the breaker.