YSK2 Integrated Motor Control & Protection Device

The YSK2 is a highly integrated motor control and protection device that combines the functions of an isolator, circuit breaker (or fuse), contactor (reversible contactor), thermal relay (intelligent motor controller), current transformer, transducer, multi-function meter, residual current protection, and programmable DDC/PLC — all in a single compact unit. Designed for AC 50/60Hz systems up to 690V and 1.25A–125A, it dramatically simplifies motor protection and control circuits while improving reliability and reducing installation costs.

Product Variants

• YSK2L-63 (Standard / Motor Protection): LED indicators, rotary setpoint adjustment. Suitable for conventional current-type motor protection and start/stop control.
• YSK2M-63 (Intelligent / Motor Protection): LED + LCD display, button-based setpoint viewing and adjustment. Ideal for field parameter inspection and historical fault query.
• YSK2S-63 / YSK2S-125 (Enhanced / Motor Protection): LED indicators + separate ST521LS measurement panel for parameter viewing, setpoint configuration, and fault history. Full motor protection, measurement, control, monitoring, maintenance, and communication functions.
• YSK2P-63 / YSK2P-125 (Intelligent Distribution): LED indicators + ST521LP measurement panel. Full feeder load protection, measurement, control, monitoring, maintenance, and communication functions.

Key Features

• Highly Integrated: Replaces isolator, breaker, contactor, thermal relay, transformer, transducer, multi-function meter, RCD, and PLC in a single device — dramatically reduces circuit complexity
• Flexible Application: Multi-CPU modular platform with shared data across all products and modules; flexible, fast configuration and programming for diverse control requirements
• Comprehensive Protection: Overload, overcurrent, short-circuit, current imbalance, single-phase ground fault, residual current, under/overvoltage, voltage imbalance, phase reversal, start stall, blockage, underload, negative sequence current, busbar overtemperature, and electrical fire alarm
• Rich Communication Interfaces: Remote 4G/5G, near-field wireless (WiFi/Bluetooth), and fieldbus (Modbus, Profibus-DP) for full lifecycle information management
• Energy Efficiency: Exceeds Class 2 energy efficiency standards; eliminates intermediate wiring in motor circuits
• Expandable I/O: Internal bus expansion for programmable I/O control modules to implement complex logic control

Standards Compliance

• GB/T 14048.4 — AC contactors and motor starters (IEC 60947-4)
• GB/T 14048.5 — Control circuit devices (IEC 60947-5-1)

OEM/ODM available. Contact Wanlong Electric for custom specifications, volume pricing, and technical support.