Residual-current overcurrent circuit breaker 2P 20A B 0.03A type AC Eaton xPole Home HNB-B20/1N/003

The Eaton xPole Home HNB-B20/1N/003 is a combined residual-current and overcurrent circuit breaker (RCBO) designed for protection of electrical circuits in residential and light commercial installations. This 2-pole device provides both overcurrent protection with a B characteristic curve and earth-leakage detection with a 30 mA sensitivity (type AC), allowing coordinated protection of wiring and people against overloads, short circuits and alternating residual currents.

Advantages

The compact RCBO integrates two protection functions in a single module, saving space in consumer units and simplifying wiring. A B tripping characteristic ensures prompt disconnection for typical residential loads and short-circuit events while maintaining selectivity with downstream devices. The 30 mA residual current sensitivity offers reliable human protection against electric shock and reduces the risk of fire from leakage currents. Eaton xPole design follows industry standards for mechanical and electrical durability, enabling long service life under normal operating conditions.

Suitable for

• Protection of lighting and socket circuits in homes
• Small commercial premises and offices with single-phase loads
• Replacement of separate MCB and RCD units to free DIN-rail space
• New consumer units where combined overcurrent and earth-fault protection is required

Key specifications

• Poles: 2-pole unit for single-phase circuits
• Rated current: 20 A continuous
• Tripping characteristic: B curve (short-circuit trip profile)
• Residual current sensitivity: 0.03 A (30 mA), type AC (responds to alternating residual currents)
• Function: Combined protection against overload, short circuit and earth leakage
• Mounting: DIN-rail compatible compact module for consumer units

How to use

Install the RCBO in the consumer unit on a standard DIN rail in accordance with local electrical regulations and manufacturer installation instructions. Connect the phase and neutral conductors to the designated terminals and ensure correct tightening torques. Use the device to feed the circuit that requires combined earth-fault and overcurrent protection; after installation, test the residual-current function using the built-in test button or a suitable external tester to verify correct operation. Commission only after verifying wiring and continuity, and observe required isolation procedures before any work on the circuit.

Usage recommendations

For reliable operation, verify compatibility with the supply system and downstream protective devices to maintain selectivity. Periodically test the residual-current trip function (usually every 6–12 months) and inspect connections for corrosion or loosening. Replace the device if it fails routine tests or shows signs of mechanical damage. Follow local codes for earthing, bonding and protective device coordination when incorporating this RCBO into an installation.