The Tonwan BK-400VA is a compact industrial control transformer designed for reliable voltage conversion in automation and control systems. Rated for 400VA and operating at 50/60Hz, this transformer steps down 480V AC input to 220V AC output, making it ideal for powering control circuits and auxiliary equipment in electrical panels.

Brand: Tonwan
Model: BK-400VA
Type: Control Transformer
Input Voltage: 480V AC
Output Voltage: 220V AC
Rated Power: 400 VA
Frequency: 50/60 Hz
Terminals: Screw terminal block (labeled 480V / 0V / 220V)
Mounting Type: Panel-mount (DIN rail or base-mount options)
Insulation Class: Class B (115°C max)
Protection: Passive ventilation, no integrated fuse
Standards Compliance:

• GB 19212.3-2012

• IEC 61558-1:2005

Manufacturer: Foshan Nanhai Qirun Electrical Appliance Co., Ltd.
Applications:

• Control panel voltage step-down

• CNC and servo systems

• Machinery safety and signal circuits

• Global equipment with differing voltage standards

The BK-400VA transformer provides safe, consistent voltage isolation and transformation, ensuring stable performance in demanding industrial environments.

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