Miniature circuit breaker
SOLARC SCB3-63
PROTECTION AGAINST OVERLOADS AND SHORT CIRCUITS, FROM 1 TO 63 A
- Ratings
- 1 to 63 A
- Breaking Capacity
- 6 kA or 10 kA
- Curves
- B, C and D
- Standard
- IEC/EN 60898-1
From 1P to 4P, from 1 to 63 A
Thirteen ratings from 1 to 63 A, in 1, 2, 3 or 4 poles of 18 mm each. 230/400 V operating voltage, 50/60 Hz, supply from the top or the bottom.
Three tripping curves
B curve (3 to 5 In) for long cable runs, C curve (5 to 10 In) for general use, D curve (10 to 20 In) for motors and transformers with high inrush current.
Breaking capacity up to 10 kA
6 kA and 10 kA versions, 4 kV impulse withstand and 500 V insulation voltage. Thermal-magnetic tripping compliant with IEC/EN 60898-1.
Built to last
20,000 mechanical and 4,000 electrical operations. IP20 terminals, IP40 front, connection up to 25 mm² at a torque of 2 to 2.5 N·m.
Documentation to download
*Product images may represent the product range, or be for illustration purposes only, and may not represent the product exactly.
Technical specifications
| SCB3-63 | |
|---|---|
| References offered by Solenso | |
| SCB3-63/2P | 32, 40 or 63 A, 10 kA, single-phase |
| SCB3-63/4P | 32, 40 or 63 A, 10 kA, three-phase |
| Electrical specifications | |
| Number of poles | 1P, 2P, 3P, 4P |
| Rated operating voltage | 230/400 V (1P, 2P), 400 V (3P, 4P) |
| Frame rated current | 63 A |
| Ratings | 1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40, 50, 63 A |
| Short-circuit breaking capacity | 6 kA or 10 kA |
| Rated insulation voltage Ui | 500 V |
| Impulse withstand Uimp | 4 kV |
| Frequency | 50/60 Hz |
| Tripping curves | B (3 to 5 In), C (5 to 10 In), D (10 to 20 In) |
| Installation | |
| Width per pole | 18 mm |
| Ingress protection | IP40 front, IP20 terminals |
| Connection cross-section | Up to 25 mm² |
| Tightening torque | 2 to 2.5 N·m |
| Reference temperature | 30 °C |
| Supply direction | Top or bottom |
| Service life and standards | |
| Mechanical endurance | 20,000 operations |
| Electrical endurance | 4,000 operations |
| Standards | IEC/EN 60898-1, GB/T 10963.1 |
Frequently asked questions
Which circuit breaker curve should I choose: B, C or D?
The C curve suits the vast majority of circuits in a home or small business: sockets, lighting, heating. The B curve trips earlier and is meant for long cable runs, where the short-circuit current stays low. The D curve tolerates the high inrush current of motors, pumps and transformers without tripping at start-up.
Do I need a 6 kA or a 10 kA circuit breaker?
The breaking capacity must be at least equal to the prospective short-circuit current where the breaker is installed. In a home supplied by the low-voltage grid, 6 kA is usually enough. The 10 kA version is required close to a transformer and in commercial or industrial installations. This calculation is the installer’s job.
See the whole protection rangeHow do I protect the output of a solar inverter?
The breaker rating is chosen from the maximum output current given in the inverter datasheet and from the cable cross-section. It is backed by residual current protection and a surge protector in the consumer unit, since the inverter is connected to the grid and exposed to its surges.
See the SOLARC SCS-40 surge protector