YOU ARE BUYING ONE COLE HERSEE (now part of LITTELFUSE) Part # 880175 Dual Pole Series - 500A High Current Metal Body Battery Disconnect Switch.

Cuts all battery power from vehicle electrical systems with applications needing switching of two circuits, or both positive and negative. 500A continuous current rating for each of the two circuits (using 2x 4/0 input and 2 x 4/0 output cables). Can be used to switch two vehicle voltage circuits simultaneously (24V and 12V). Disconnect a battery or multiple batteries, in either the positive or the negative line. 

Please find the datasheet: http://www.littelfuse.com/~/media/commercial-vehicle/hot-feeds/littelfuse-switches-dp-master-disconnect-880175-d647-info-sheet.pdf

APEX ELECTRONICS are a STOCKING FRANCHISED DISTRIBUTOR for LITTELFUSE and COLE HERSEE parts see http://apexelectronics.co.uk

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