Siemens 3VL9550-7DC30 is a three-pole overcurrent release (trip unit) for VL630 protection in low-voltage distributions. It combines thermal and magnetic elements to deliver overload and short-circuit protection with an instantaneous rating of 400–500 A (LI/IR) and a long-time overload range of 2,500–5,000 A (II). Designed to be used with VL630 three-pole breakers, this release provides coordinated line protection across all three phases in Siemens Sentron protection schemes.
