Technical Parameters Parameter Category Specification Base Device GSH204 - 400A frame high-performance contactor. The 204 denotes the 400A frame size within the GSH series. Handle & Accessory Code -C25A - This suffix defines the operating mechanism and included internal accessories. A typical decoding is: • C: Front-mounted rotary handle for manual operation. • 25: Likely a specific handle type or accessory package code. • A: Often indicates the inclusion of standard accessories. For GSH series, A commonly means the contactor is supplied with: - Auxiliary Contacts (typically 2 NO + 2 NC). - Mechanical Interlock provision or specific mounting配件. Rated Operational Current (Ie) 400 A (at AC-3, 400V). This is the key rating of the GSH204 frame. Rated Operational Voltage (Ue) Up to 690 V AC Control Coil IMPORTANT: The model GSH204 -C25A does not specify the coil voltage or type. This is a critical missing specification. The contactor requires a separate coil, ordered with a code like GSH204 A230 for a 230V AC coil, which is then combined with the -C25A handle/accessory code. Utilization Categories AC-3 (For squirrel-cage motors: Starting, switching off during running) AC-4 (For squirrel-cage motors: Starting, plugging, inching - at a significantly reduced current rating) AC-1 (Non-inductive loads) Switching Capacity • Rated Making Capacity (Icm): Very high, typically several thousand Amperes (e.g., 4000A peak) to handle motor inrush. • Short-circuit Withstand: Requires backup fuse/circuit breaker for short-circuit protection. Mechanical Life ≥ 10 million operations Electrical Life (AC-3) ≥ 1.0 million operations at full rated current (400A) Auxiliary Contacts (if A includes them) Typically 2 changeover (NO+NC) contacts, rated for control circuits (e.g., 10A, 600V AC). Terminals Large screw-clamp terminals or busbar connections for high-current cables. Mounting Robust foot mounting for panel installation. May require a sturdy backplate. Dimensions & Weight Substantial. Approx. width > 200mm, weight > 10kg.