Relay enables total disconnection of electric vehicles' battery

October 09, 2012 // By Julien Happich
Available from specialist distributor Switchtec, the HVF12 power relay from Hongfa enables the safe storage of electric vehicles without battery drain and also the prevention of fire in the event of an accident.

Modern electric vehicles consume battery power even when the ignition is off. The HVF12 relay allows complete battery isolation for vehicle manufacturers, preventing battery drain, and enabling the vehicle to start after long periods of no use. The relay is also used to disconnect the battery in the event of an accident to prevent fire as a result of possible short circuits.

The HFV12 has a single pole normally open (N/O) contact and is capable of switching a massive 190A at 16VDC. The relay also has an impressive inrush current withstand capability with ratings of 1500A for 0.2s or 1000A for 1s. The HFV12 is a latching relay, where the coil is pulsed to turn on and similarly, pulsed to turn it off. As such, the relay does not need constant coil power, and is therefore very energy efficient and in battery operated situations will not further drain the battery once operated.

The HFV12 is fitted with a four pin, automotive style connector (AMP 0.070 Series) for a secure and quick fit. For mounting, the HFV12 is fitted with a metal bracket for direct surface mounting on a bulkhead or similar surface.

As the HFV12 was designed for arduous automotive use, its specification is high and thus it is very transferable for use in other applications. For example, it features an excellent -40 to +120ºC ambient temperature rating. It is IP54 sealed, 22Hz to 500Hz 98m/s2 vibration resistance, and 392m/s2 shock resistance.

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