Changeover switch CNC YCBZ-40 3P 40A manual transfer switch for three-phase circuits

CNC YCBZ-40 is a modular 3-pole manual changeover switch with a 40 A rated current and three contact positions (1‑0‑2). It is designed for switching, making and breaking loads in AC 50/60 Hz, 230/400 V circuits and enables reliable transfer between two power sources such as mains and backup generator or UPS. The device mounts on a 35 mm DIN rail and complies with IEC/EN 60947-3 and relevant EMC requirements.

Advantages

The changeover switch provides a compact, DIN-rail mountable solution for quick manual transfer of three-phase loads. It offers clear mechanical positions and a common upper contact for secure switching, supports up to 40 A rated current, and meets international switch-disconnector standards. The unit’s construction allows straightforward installation and maintenance in residential, workshop or small commercial electrical panels.

Suitable for

• Manual transfer between mains and generator or UPS in three-phase systems
• Use in residential electrical panels and small commercial or workshop distribution boards
• Applications requiring a compact DIN-rail mounted switch-disconnector for maintenance or emergency power changeover

Key specifications

• Product: Changeover switch CNC YCBZ-40 3P 40A (manual transfer switch)
• Poles: 3
• Rated current (Ie): 40 A
• Rated voltage (Ue): AC 400 V; maximum voltage AC 415 V
• Frequency: 50/60 Hz
• Contact form: I - 0 - II (1‑0‑2)
• Mechanical life: 8500 cycles; Electrical life: 1500 cycles
• Mounting: DIN rail EN60715 (35 mm)
• Cable cross-section: up to 10 mm²
• Operating temperature: -5 °C to +40 °C
• Dimensions: 54 x 61 x 77 mm
• Protection class: IP20
• Colour: white
• Standards: IEC 60947-3 / EN 60947-3, category AC-22A

How to use

Install the switch on a standard 35 mm DIN rail inside the distribution enclosure and connect supply and load conductors to the appropriate terminals following the wiring diagram and local electrical codes. Operate the external handle to select position 1, 0 or 2 for the desired power source; ensure the switch is used only under the specified rated conditions. Perform isolation and verify dead state before maintenance work.

Recommendations

Use the CNC YCBZ-40 in environments within the specified temperature range and with conductors not exceeding 10 mm². Verify compatibility with connected generators or UPS systems and respect the rated current and voltage to ensure safe operation and longevity.