The Hager ADB420U is a combined Residual-Current Breaker with Overcurrent protection (RCBO). It is designed for standard electrical distribution boards and provides overload and earth leakage protection in a single, compact module. It features a 20 A rated current. The device has a 30 mA Type A residual current sensitivity for protection against AC and pulsating DC leakage. It uses a B-curve trip characteristic suited to general power and lighting circuits. The RCBO has a 10 kA short-circuit breaking capacity for effective fault isolation. It fits a single modular space (1M) on DIN rails. It is suitable for residential, commercial, and light industrial circuits requiring combined circuit protection with space-efficient installation.
The Hager ADB420U is suitable for protecting individual circuits, such as lighting circuits, socket groups, and distribution runs, in domestic, commercial, and light industrial electrical installations. Its combined protection characteristics help maintain electrical safety by simultaneously addressing both overcurrent and earth-leakage faults in consumer units and distribution boards.
The ADB420U offers a reliable, standards‑compliant solution for overload and residual-current protection in a single device. Type A residual current detection improves safety by detecting both AC and pulsating DC leakage. The B‑curve trip profile balances protection sensitivity with nuisance trip resilience for everyday circuits. Its compact 1M form factor optimises distribution board space and simplifies panel layouts for installers and designers.
| Superlec Code | ADB420U |
| Product Type | RCBO |
| MCB/RCBO Curve | B |
| Amperage | 20A |
| MCB Size | Single Pole(SP) |
