Main circuit protection in residential distribution systems
ETM1-63UH Series Miniature Circuit Breaker is specifically designed for terminal power distribution protection in commercial office buildings, residential premises, and general industrial applications. It is suitable for circuits with AC 50/60Hz, a rated voltage of 110/240/415V, and a rated current up to 63A.
Featuring overload and short-circuit protection, it can also be used for infrequent line switching operations under normal conditions. With a maximum ultimate short-circuit breaking capacity (Icu) of up to 15kA, it ensures reliable circuit protection.


| General data | |
| Protection | Overcurrent and short circuit |
| Type of trip | Thermal-magnetic |
| No.of poles | 1P,2P,3P,4P |
| Rated operational voltage(Ue) | 1P:110/230V,120/240V,230/400V,240/415V 2P,3P,4P:230/400V,240/415V,400/415V |
| Rated current (In) | 1,2,3,4,5,6,8,10,13,16,20,25,32,40,50,63A |
| Rated frequency | 50/60Hz |
| Rated insulation voltage(Ui) | 415V |
| Rated impulse withstand voltage(Uimp)(1.2/50μs) | 6kV |
| Dielectric testvoltage | 2KV(50/60Hz,1 min.) |
| Fire resistance(glow-wire test) | 960±15℃(Enclosure);650±10℃(Handle) |
| Pollution degree | 2 |
| Data acc.to IEC/EN60947-2 | |
| Rated ultimate short circuit breaking capacity lcu(kA) | 15kA |
| Rated service short circuit breaking capacity Ics(kA) | 7.5kA |
| Thermal tripping characteristics | 1.05×In No tripping within an hour;1.3×ln Tripping within an hour |
| Instantaneous tripping characteristics | 8ln-12In |
| Mechanical data | |
| Electrical life | 4,000 Cycles |
| Mechanical life | 20,000 Cycles |
| Contact position indication | green OFF/red ON |
| Protection degree | IP20 |
| Reference temperature | 30℃ |
| Operating ambient temperature(with daily average≤35℃) | -25℃~+55℃ |
| Storage temperature | -30℃~+70℃ |
| Installation | |
| Terminal connection type | Cable/Pin-type/Fork-type busbar |
| Termina block | Screw press-connected |
| Max.terminal size for cable | 16mm²flexible/25mm²rigid |
| Max.tightening torque | 2.5N.m |
| Mounting type | Mounting on 35mm DIN rail |
| Incoming method | Bi-Directional |
| Auxiliary for remote tripping or signaling | |
| Auxiliary Contact | Yes |
| Auxiliary&Alarm Contact | Yes |
| Shunt Release | Yes |
| Shunt Release &Auxiliary Contact | Yes |
| Voltage Loss Release | Yes |
| Over-voltage Release | Yes |
| Undervoltage Release | Yes |
| Over-undervoltage Release | Yes |
| Mechanical Interlock | Yes |



