CNC YCBZ-40 40A 2-Pole Manual Changeover Switch

Product Identification

Important: The attached product is not a conventional MCB. It is a manually operated changeover switch for selecting between two AC sources. No automatic transfer, overload, short-circuit, earth-leakage or surge-protection function is claimed.

Short Description

The CNC YCBZ-40 is a 40A, 2-pole manual changeover switch for controlled I–0–II selection between two AC power sources. Designed for 35 mm DIN-rail mounting, it supports 240/415V AC systems, AC-22A utilization and IEC 60947-3 switch-disconnector applications.

Long Description

Built for compact low-voltage distribution boards, the CNC YCBZ-40 provides deliberate manual transfer between two AC supplies through a mechanically linked 2-pole operating handle. Its three-position 1–0–2 contact form gives users a defined centre-off position between Source I and Source II, making it suitable for professionally designed grid/generator, grid/inverter and other backup-source selection panels.

The 40A version is rated by CNC for 240/415V AC at 50/60Hz, with AC-22A utilization, IP20 protection and 35 mm DIN-rail installation. CNC lists 1,500 electrical operating cycles and 8,500 mechanical cycles for the YCBZ-40 series. Correct cable sizing, upstream circuit protection and installation by a qualified electrician are required for a complete safe system.

Key Features

• 40A rated-current variant

• 2-pole mechanically linked switching

• Manual I–0–II / 1–0–2 source selection

• Centre-off position between the two supply positions

• 240/415V AC official series rating

• 50/60Hz rated frequency

• AC-22A utilization category

• IEC 60947-3 switch-disconnector standard

• IP20 protection degree

• 10 mm² terminal/cable capacity

• 35 mm DIN-rail mounting with fast-clip mechanism

• 1,500 electrical and 8,500 mechanical operating cycles

Technical Specifications

Applications

• Residential backup-power distribution boards

• Commercial low-voltage source-selection panels

• Manual grid-to-generator selection

• Manual grid-to-inverter selection

• Backup supply isolation and transfer arrangements

• Single-phase systems requiring 2-pole switching

• Solar and hybrid installations on the AC distribution side

• Small industrial and agricultural control panels within the verified electrical ratings

Box Contents

• 1 × CNC YCBZ-40 40A 2-pole manual changeover switch

• Printed instruction sheet/manual: Not Verified

• DIN-rail or enclosure hardware: Not Verified

• Cables, lugs and upstream protection devices: Not Included / Not Verified

Protection Features

• IP20 finger-protection degree for the device enclosure

• Mechanically linked 2-pole operation

• Centre-off I–0–II contact arrangement for deliberate manual source selection

• Switch-disconnector function under normal circuit conditions

Not integrated or not verified: overload protection, short-circuit protection, residual-current/earth-leakage protection, surge protection and automatic source transfer. Appropriate upstream protective devices must be selected separately by a qualified system designer or electrician.

Certifications

Warranty

CNC's official warranty policy states 24 months from the date of manufacture for other low-voltage apparatus. The period may be changed by the signed customer contract. Local seller/distributor warranty, claim process and exclusions should be confirmed before purchase.