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The SZD11-25/400010 is a three-phase four-wire (3P+N) manual load disconnector with a rated current of 25A. It is panel-mounted and has a gray-black casing. Its core function is to provide safe and reliable connection and isolation for AC three-phase four-wire systems (including the neutral line), and it is equipped with a padlock mechanism in the OFF position to prevent accidental operation and meet safety operating procedures.
Core Parameters and Characteristics:
Rated Values: Rated operating current 25A, rated operating voltage AC 440V, 50Hz-60Hz.
Compliant Standards: GB/T 14048.3, IEC 60947-3.
Number of Poles and Functions: 4 poles (3P+N). Handle Operation: Two Positions (ON/OFF):
ON Position: All three-phase main contacts (T1-L1, T2-L2, T3-L3) and the neutral pole (N) are connected.
OFF Position: All poles (3P+N) are fully disconnected, providing complete electrical isolation. A padlock (sold separately) can be added in this position for mechanical locking.
Construction and Installation: Panel mounted with a gray-black panel handle. Features a large insulation distance and quick-break design for enhanced operational safety and reliability.
Wiring and Lifespan:
Wiring: M3.5 screws, wire diameter 2.5 – 6.0 mm², tightening torque 0.8 N·m.
Operating Frequency: 8-hour duty cycle/intermittent cycle duty, operating frequency 30 times/hour.
Electrical Life: ≥ 10,000 cycles under AC-23 category; ≥ 6,000 cycles under AC-3 category; auxiliary contacts ≥ 2,000 cycles.
Operating Conditions: Ambient temperature -25°C to +40°C, altitude ≤ 2000m.
Application Scenarios
This switch is suitable for applications requiring safe switching, isolation, and locking of small to medium power three-phase four-wire loads, and is a key component ensuring safe equipment maintenance.
Main Power Switch for Small and Medium-Sized Equipment: As a main power isolating switch for three-phase four-wire equipment such as commercial air conditioners, ventilation equipment, water pumps, and small processing equipment with a rated current not exceeding 25A, its four-pole disconnection ensures complete isolation between the phase and neutral lines.
Safety Isolation Point in Distribution Boxes: In distribution boxes in commercial locations, laboratories, and small factories, it serves as a branch circuit isolating switch requiring complete electrical isolation, particularly suitable for TN-S or TN-C-S systems where the neutral line needs to be disconnected for safe maintenance.
Safety Lockout (LOTO) Applications: The padlock function in the OFF position makes it ideal for implementing lockout and tagging safety procedures, providing reliable protection for maintenance personnel, and suitable for facilities requiring compliance management.
Direct Control and Local Operation: It can be used for direct control of small-capacity three-phase motors (AC-3 loads) that are not frequently operated, and can be installed on a control panel for easy local safe operation.
