Cranes DC Contactors

Type C80 DC Contractors

Featuring forged steel armature levers and magnet frames for superior physical strength, these DC Mill type contactors contain self-lubricating bearings to reduce downtime and are ideal for heavy industrial environments.

Hinged to provide easy access for repairs and inspections, their arc chutes and magnetic blowout structures are designed to quickly absorb and dissipate the heat caused by arcing. The pivot pin assembly provides positive pin locking so that the bearing pin remains stationary with respect to the operating movement of the forged armature. A leaf spring attached to the unit base and the arc chute holds the chute in the “down” or functioning position.

Pre-drilled mounting holes are provided on the unit base to accommodate interlock mounting brackets. An interlock is merely attached to a bracket and the assembly is then bolted in the desired operating position on the contactor.

Type C82 Inductive Time Limit Contactor

By connection of the holdout coil (H.O.) to various points in control circuits, the Ltl contactor can be used to control acceleration or plugging in hoist and travel panels.

The construction of the arc chute, blowout and power contacts of these contactors is the same as for C80 DC contactors with parts being interchangeable between the two types.

Course adjustment of the timing is accomplished by removing shims to vary the air gap of the holdout coil circuit. Fine adjustment is made with a knurled nut at the base of the holdout coil magnet core.

DC Contactors — Types KD & KS

Bulletin 7400 Type KD (Normally Open Pole) and Type KS (Normally Closed Pole) contactors are designed for front mounting directly on steel panels and require no special hardware or insulators. Electrical clearances are factored in with hot-moulded reinforced polyester insulators.

Like the C80 contactors, the KD & KS range utilise DC coils and features forged steel armature levers and magnet frames for superior physical strength. Their self-lubricating bearings combined with the short stroke armature results in a mechanical life of more than 20 million operations.

The arc chutes and magnetic blowout structures are designed to absorb and dissipate the heat caused by arcing quickly. In addition to increasing contact life, the moulded arc chute offers advantages of improved mechanical life and cooling characteristics plus superior arc-tracking resistance.

Designed with a front-mounted combined head assembly, the Type K contactors are available with blowout coils rated 3, 7.5, 15, 25 and 50 amperes or without blowout, and are easily changed in the field.

Features

Thirty years of continual improvements ensure the KD & KS ranges offer long life, low maintenance and interchangeable parts.