Doepke DFS 4 040-4/0.03-B+ All-Current Sensitive RCCB, 4-Pole, 40 A, 30 mA, Type B+ 09134895

This Doepke DFS 4 040-4/0.03-B+ is an all-current sensitive residual current circuit breaker (RCCB) with a rated current of 40 A and a residual operating current of 30 mA. Unlike standard AC or A types, its Type B+ characteristic enables detection of smooth DC residual currents, making it suitable for circuits with three-phase rectifiers, frequency converters, or EV charging infrastructure.

Highlights

• All-current sensitive Type B+ for comprehensive protection
• 4-pole design for three-phase networks
• 30 mA residual current rating for personnel and fire protection
• Compact 4-module width fits standard DIN rails
• High short-circuit withstand capability of 10 kA

In daily use

Install this RCCB on a 35 mm DIN rail in distribution boards. Its screw terminals accept conductors from 1.5 to 50 mm², ensuring secure connections. The device operates reliably across a wide temperature range from -25 °C to +60 °C, making it suitable for demanding environments.

Full specifications

• Rated current: 40 A
• Rated residual current: 30 mA
• Number of poles: 4
• RCD type: B+ (all-current sensitive)
• Rated voltage: 230/400 V AC
• Rated frequency: 50 Hz
• Short-circuit withstand capability: 10 kA
• Rated impulse withstand voltage: 4 kV
• Surge current withstand capability: 3 kA
• Mounting type: DIN rail (35 mm)
• Terminal capacity: 1.5 - 50 mm²
• Module width: 4 modules (72 mm)
• Rated switching capacity: 500 A

Final note

Designed for reliable residual current protection in modern electrical installations, the DFS 4 040-4/0.03-B+ meets the demands of professional electricians and system integrators.