Product Identification and Compliance
It is a 3 x 3P device (three power poles, each with three normally-open contacts) with a 110 V AC 50/60 Hz control coil. Per the specification, it is rated for motor power up to 110 kW at 220/230 V, 220 kW at 380/400 V and 415 V, and 250 kW at 440 V, all at 50/60 Hz. This unit is fully compliant with IEC 60947-4-1, IEC 60947-1, EN 60947-1, JIS C8201-4-1, and EN 60947-4-1, providing a defensible basis for specification in tender submissions.
Key Ratings and Performance Characteristics
The AC-3 utilisation category rating means this starter is specifically rated for starting squirrel-cage motors and switching them off during running — the standard duty for motor control. The rated insulation voltage (Ui) is 1000 V per IEC 60947-4-1 and 1500 V per VDE 0110 group C, giving headroom for 690 V systems. The rated breaking capacity is 2120 A and the rated making capacity is 2650 A, both conforming to IEC 60947-4-1, which defines the fault-clearing and inrush-handling capability respectively. The associated fuse recommendation is 400 A gG or 315 A aM up to 440 V — this is the coordination point for short-circuit protection and must be respected for Type 2 coordination.
Control Circuit and Auxiliary Contacts
The control circuit operates on 110 V AC 50/60 Hz with an operational voltage range of 0.85 to 1.1 Uc and a drop-out range of 0.35 to 0.55 Uc. Inrush power is 650 VA at 40-400 Hz, cos φ 0.9 at 20 °C. The auxiliary contact composition is factory-configured for star-delta operation: 1 NC and 1 NO on the star contactor (KM1), 2 NC and 1 NO on the line contactor (KM2), and 1 NC and 2 NO on the delta contactor (KM3). The mechanical interlock between the star and delta contactors is integral — this prevents simultaneous closure, a mandatory safety requirement for star-delta starting.
Mechanical and Environmental Specifications
The unit is mechanically robust: it withstands vibrations of 2 Gn at 5-300 Hz when open and 5 Gn at 5-300 Hz when closed, and shocks of 15 Gn for 11 ms when closed and 6 Gn for 11 ms when open. The front face with shrouds provides IP20 protection per IEC 60529 and VDE 0106. Protective treatment is TH (tropicalized) for humid environments. Heat dissipation is 8 W.
Mounting and Connection Details
Mounting is plate-mount — not DIN rail — so panel layout must allocate a dedicated mounting surface. Dimensions are 10.5 in (266 mm) depth, 24.6 in (625 mm) width, and 4.3 in (110 mm) height. Power circuit connections use bolted lugs or ring terminals up to 240 mm², with a bolt diameter of M10 and a tightening torque of 309.8 lbf·in (35 N·m). Control circuit connections use screw clamp terminals accepting 1 to 4 mm² flexible with or without cable end, or solid wire. The unit is pre-wired, reducing field wiring time for the star-delta configuration.