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The SZD11-40/30001U is a manual load disconnect switch designed specifically for three-phase (3P) power circuits, with a rated current of 40A. This panel-mounted product integrates a safety padlock function, providing a reliable manual operation and mechanical locking solution for power isolation, load switching, and maintenance safety of electrical equipment. Its design complies with relevant safety standards and is suitable for applications requiring clearly defined disconnection points and operational access control.
Rated operating current: 40A
Rated operating voltage: AC 440V, 50Hz-60Hz
Number of poles: 3P (three-phase)
Compliance standards: GB/T 14048.3, IEC 60947-3
On/off function: Two-position (ON/OFF) operation.
ON position: All three-phase main contacts (T1-L1, T2-L2, T3-L3) are reliably connected.
OFF position: All main contacts are completely disconnected, providing a visible electrical isolation point that meets safety distance requirements.
Safety Locking: A padlock hole (locker sold separately) is provided in the OFF position for mechanical locking to prevent unauthorized or accidental operation.
Installation Method: Panel mounting, easy to install and operate on control cabinets, distribution box doors, or equipment surfaces.
Performance Characteristics: Offers greater insulation distance and faster disconnection capability than similar products, improving operational safety and electrical reliability.
Wiring Capacity: M4 terminal screw specification, suitable for conductor cross-sectional area 6.0 ~ 10 mm², recommended tightening torque 1.2 N·m.
Rated Duty Cycle: 8-hour duty cycle/intermittent periodic duty, operating frequency: ≤ 30 times/hour.
Electrical Life: AC-23 (resistive load, distribution) service category: ≥ 10,000 cycles. AC-3 (cage motor load) service category: ≥ 6,000 cycles.
Operating Conditions:
Ambient Temperature: -25°C to +40°C (average temperature ≤ +35°C over 24 hours). Altitude: ≤ 2000 m.
Relative Humidity: Not exceeding 50% at +40°C; up to 90% at lower temperatures (e.g., +20°C) (protective measures must be taken to prevent condensation).
This switch is specifically designed for industrial and commercial electrical circuits requiring manual switching and safety isolation of three-phase loads, and is installed on an operating panel.
Main Power Switch and Maintenance Isolation Point: Serves as the main power isolation switch for three-phase equipment such as ventilation equipment, air conditioning units, water pumps, and compressors with a rated current not exceeding 40A. Its lockable function provides a safe electrical isolation and locking point for equipment maintenance.
Manual Operation Switch for Control Cabinets: Installed on the operating panel of industrial control cabinets and distribution boxes, it serves as a local manual control switch for loads such as fans, motors, and heating equipment, facilitating direct and safe start-up and shutdown operations by operators.
Safety Distribution Circuit Isolation: Used as a manual isolating switch in distribution branch circuits requiring a clearly defined physical disconnection point for safe isolation during load switching and maintenance.
Direct control of small-capacity motors: control circuits that can be directly used for small-capacity three-phase asynchronous motors that are not frequently started and stopped (AC-3 load category).
