Auxiliary multipolar device for testing electrical instruments

A multipolar auxiliary testing device for electrical instruments comprising:

• a modular set of dielectric containers housing electrical contacts configured to interrupt control and potential signals, and short-circuit and interrupt current signals between a primary electrical system and associated measuring, control or protection instruments, the device including rear screw terminals and a front frame with windows for insertion of a test blade (paddle);
• wherein each current-signal contact assembly comprises a primary-side terminal, an instrument-side terminal, a flexible conductor, and an independent short-circuit arm configured to engage a rigid conductive short-circuit bridge bar prior to separation of the main contacts;
• wherein all contact terminals are biased toward the paddle corridor by torsion springs that maintain mechanical and electrical engagement with the paddle tooth profile until displaced;
• wherein the dielectric containers include dielectric walls defining independent insulating chambers dimensioned to provide at least 2500-V insulation between adjacent poles;
• the paddle is inserted in discrete linear steps by linear ratchet elements formed by ratchet teeth engageable with a locking bolt mounted in the block;
• manual trigger levers, mechanically coupled by a square rod extending across the paddle, are configured to release each discrete step by disengaging the corresponding ratchet tooth from the locking bolt;
• and
• the ratchet elements include bidirectional locking teeth configured to prevent forward or reverse movement of the paddle while the locking bolt remains engaged within a ratchet slot.