Core Technical Parameters
1. Main Circuit Parameters
Number of Poles: 3-pole normally open (3NO)
Rated Operating Current:
AC-3 (Motor Load): 12A @ 400V
AC-1 (Resistive Load): 25A
Rated Insulation Voltage: 690V AC
Impulse Withstand Voltage: 6kV
Suitable Motor Power:
400V: 5.5kW
230V: 3kW
2. Auxiliary Contacts
Standard Configuration: 1NO + 1NC (Mechanical Interlock, IP20 Finger Protection)
3. Control Coil
AC Voltage: 24V, 36V, 48V, 110V, 220V, 380V (50/60Hz)
DC Voltage: 24V, 48V, 110V
DC Coil: Built-in freewheeling diode, protecting the control circuit
4. Environment and Certifications
Protection Rating: IP20
Operating Temperature: -25℃ ~ +60℃ (Derating required at 60–70℃)
Certifications: IEC 60947-4-1, UL 508, CE, CCC, RoHS
5. Mechanical and Electrical Life
Mechanical Life: Approx. 15–30 million cycles
AC-3 Electrical Life: Approx. 2 million cycles
6. Installation and Dimensions
Installation Method: 35mm DIN rail / Panel mount
Dimensions (W×H×D): 45mm × 77mm × 93mm
Weight: Approx. 340g
III. Structural and Functional Features
Modular Design: Can be directly fitted with LADN series auxiliary contacts, LA2 series time delay heads, and mechanical interlock modules, flexibly forming reversible, star-delta, and other starting schemes.
High-Efficiency Arc Extinguishing: Optimized arc extinguishing system, reducing contact erosion and extending service life.
Convenient Wiring: Cage/screw terminal blocks, supports 1.5–6mm² cables, secure and reliable.
Direct thermal overload relay connection: Can be directly connected to LRD series thermal overload relays to quickly form a complete motor protection circuit.
IV. Typical Application Scenarios
Direct start, stop, and forward/reverse control of three-phase asynchronous motors (≤5.5kW)
Control of industrial equipment such as fans, pumps, conveyors, and packaging machinery
Distribution cabinets, PLC control cabinets, and automated production lines
Remote on/off control of resistive loads such as lighting and heating
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