Safety locks - the general information

Various combinations of safety locks, fusible inserts and chain breakers are applied to protection of contact chains of an electric equipment of the car. The main assembly block is established in an impellent compartment, one more assembly block of safety locks is located in car salon, at the left under the panel of devices (see Has undressed Assembly blocks of safety locks/relays - the general information, removal, installation, replacement of safety locks).

Each separate safety lock is used for protection of any concrete electric contour, or at once several contours. The label with an identification card of placing of safety locks in the assembly block is usually glued to a cover of the last.

In assembly blocks the safety locks of a compact design equipped with bayonet contact plugs, if necessary easily taken by fingers from the landing nests in the block are located. At refusal any of electric power consumers first of all always it is necessary to check a condition of a corresponding safety lock. Turn a key in the ignition lock in position ON and by means of a lamp-sampler probe open plugs of a safety lock in the assembly block, - if the lamp lights up at connection to each of plugs, hence, the safety lock as it should be if pressure takes place only from outside food givings, means, the safety lock has fused. We will notice also that usually the safety lock case is made of transparent plastic through which it is easy to define a condition of a working crosspiece.

At replacement of the fused safety lock strictly watch that the established replaceable element corresponded on type failed, - the safety locks calculated on a various nominal current strength physically can differ nothing from each other, without being thus interchangeable. Each of electric chains has various working parametres and requires various degree of protection, therefore safety lock replacement (calculated on a certain current strength) not corresponding to it on parametres is fraught with the most serious consequences (up to ignition). Working parametres of a safety lock (a nominal current strength) are usually designated on its plastic case.

If the new safety lock after installation also fails at once, it is not meaningful to make its further replacement, - before it is necessary to reveal and eliminate the reason of occurrence of an overload in a chain. In most cases that appears the short circuit of connecting electroconducting caused by damage of its isolation.