The 57.3777-02 is a current-interrupting relay that controls turn signal indicators and hazard warning systems in heavy commercial vehicles operating on 24 V electrical systems. Manufactured by PZ "EMI" LLC — an Penza-based specialist producer of automotive electromechanical components supplying all regions of Russia and CIS countries — this unit is a certified direct replacement for the РС 951 А type, cross-referenced as KAMAZ catalog number 5320-3726410.
The relay maintains an interruption frequency of 60 to 120 cycles per minute, delivering the blink cadence required by Russian and CIS vehicle safety regulations for both turn signals and four-way hazard flashers. The defining feature of the -02 version is its integrated short-circuit protection circuit, which shields the vehicle's wiring harness and lamp circuits from fault-current damage, preventing failures from propagating into adjacent systems.
Weighing just 82 g, the unit is compact and straightforward to fit. Compatibility spans the most widely operated heavy-duty platforms on Russian roads: KAMAZ, MAZ, SuperMAZ, GAZ, ZIL, URAL, and BELAZ trucks and dump trucks.
EMI marks every unit with its proprietary logo, enabling buyers to confirm authenticity at point of sale; distributors can supply certificates of conformity on request. Orders are dispatched within 1–3 business days after prepayment, with delivery to transport carriers across Russia.
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