12-4-predokhraniteli-i-plavkie-vstavki-obshhaya-informaciya.html

12.4. Safety locks and fusible inserts - the general information

The assembly block of safety locks / relay (No. 2) located in an impellent compartment

Salonny assembly block of safety locks

Various combinations of safety locks, breakers of a chain and fusible inserts are applied to protection of contact chains of electric equipment of the car. Assembly blocks, are established under the dashboard and in an impellent compartment of a vehicle (see the illustrations Located in an impellent compartment the assembly block of safety locks / relay (No. 2) and Salonny the assembly block of safety locks).

Each separate safety lock is used for protection of any concrete electric contour or at once several contours. The ID card of placement of safety locks in the assembly block is usually glued to a cover of the last, from its internal party.

In assembly blocks the safety locks of a compact design equipped with bayonet contact plugs, and if necessary easily taken by fingers from the nests in the block are located. At refusal any of consumers of the electric power first of all always it is necessary to check a condition of the corresponding safety lock. Turn a key in the ignition lock in the situation ON and by means of a lamp sampler probe open plugs of each of safety locks. If the lamp lights up at connection to each of plugs, therefore, a safety lock as it should be. If tension takes place only from food giving, means, the safety lock fused. Let's notice also that usually the case of a safety lock is made of transparent plastic through which it is easy to define a condition of a working crossing point (see an illustration of Salonny the assembly block of safety locks).

At replacement of the fused safety lock strictly watch that the established replaceable corresponded on type left of an element. The safety locks calculated on a various nominal current physically can differ nothing from each other, without being thus interchangeable. Each of electric chains has various working parameters and needs various extent of protection therefore replacement of the safety lock calculated on a certain current, not corresponding to it on parameters is fraught with the most serious consequences (up to fire emergence). Working parameters of a safety lock (a nominal current) 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 emergence of an overload in a chain. In most cases that appears the short circuit of connecting electroconducting caused by damage of its isolation.

Fusible inserts

Fusible inserts are used for protection of chains in which for any reason usual safety locks, such as a contour of system of ignition, and also for power chains in which the vysokoamperny current circulates cannot be used.

On the Infiniti QX4 models fusible inserts are placed in the assembly block of safety locks located in an impellent compartment (see the illustration Located in an impellent compartment the assembly block of safety locks / relay (No. 2)).

For replacement of a fusible insert disconnect a negative wire from the battery and, having pulled failed an element, take it from the landing nest.

Before establishing to the place of the failed fusible insert the new it is necessary to find out and eliminate the reason of a taking place overload.