C65 Surge Protective Backup Protector
Limits induced lightning surges and internal grid overvoltages; 35mm DIN rail mounting, 2P/4P options, covering T1/T2/T3 test classes.
Overview
Key Features
Low Residual Voltage
Voltage protection level down to 1.5kV with response time ≤50ns, clamping overvoltages quickly
Multiple Configurations
2P/4P and 275V/385V combinations, compatible with AC and DC systems
High Surge Capacity
Nominal discharge current 20kA, maximum 40kA, absorbing high-energy impulses
T2 Class Protection
Effectively discharges induced lightning surges and internal grid overvoltages
Fast Response
Completes energy discharge within ≤50ns, protecting downstream precision equipment
Compact Design
2P is 36mm wide and 4P is 72mm wide, saving distribution box space
Technical Data
| Rated operating voltage | 230/400V AC |
| Operating frequency | 50/60Hz |
| Maximum continuous operating voltage Uc | 275V / 385V AC |
| Nominal discharge current In | 10 / 20 / 30 / 40kA |
| Maximum discharge current Imax | 20 / 40 / 60 / 80 / 100kA |
| Voltage protection level Up | 1.5kV (Uc=275V) / 1.8kV (Uc=385V) |
| Response time | ≤50ns |
| Power-frequency short-circuit operating current | 3A |
| Power-frequency disconnection time | 0.3s |
| Power-frequency current disconnection cycles | 1000 cycles |
| Poles | 1P / 2P / 3P / 4P |
| Maximum conductor cross-section | 6~25mm² |
| Ambient temperature | -40℃ ~ +80℃ |
| Dimensions | 87.5×81.5×18mm (single pole) |
| Remote signalling | Ordered separately |
| Mounting | Standard 35mm DIN rail |
Models & Selection
| Parameter | SCSCB15 | SCSCB80 | SCSCB60 | SCSCB40 | SCSCB20 |
|---|---|---|---|---|---|
| Test class | T1 | T2 | T2 | T3 | T3 |
| Maximum impulse current Iimp | 15kA | — | — | — | — |
| Maximum discharge current Imax (8/20μs) | — | 80kA | 60kA | 40kA | 20kA |
| Suitable SPD | ≤15kA (10/350μs) | ≤80kA (8/20μs) | ≤60kA (8/20μs) | ≤40kA (8/20μs) | ≤20kA (8/20μs) |
| Power-frequency short-circuit breaking capacity ISC | 50kA | 50kA | 25kA | 25kA | 15kA |
Model naming rule：SCSCB15 SCSCB80 SCSCB60 SCSCB40 SCSCB20
Installation
FAQ
Which models make up the C65 backup protector range?
The range covers five models, SCSCB15, SCSCB20, SCSCB40, SCSCB60 and SCSCB80, in T1 and T2/T3 test classes. Maximum discharge current runs from 20kA to 100kA, and SCSCB15 is the T1 variant with 15kA maximum impulse current.
What role does the backup protector play in an SPD circuit?
It is connected in series ahead of the SPD and provides power-frequency short-circuit breaking capacity of up to 50kA. Operating current is 3A and disconnection time is 0.3s, preventing fire when a degraded SPD short-circuits.
How does SCSCB15 differ from the other models?
SCSCB15 belongs to test class T1 with a maximum impulse current of 15kA (10/350μs), so it sits at the direct lightning strike entry. The other models are T2/T3 classes, matched to SPDs of 20kA to 80kA on the 8/20μs waveform.
What are the mounting and wiring requirements?
Mounting is on a standard 35mm DIN rail, with a single-pole outline of 87.5×81.5×18mm and maximum conductor cross-section of 6~25mm². The supply side is wired to L1/L2/L3, N and PE.
What is the operating temperature range and certification status?
Operating temperature ranges from -40℃ to +80℃ and the device withstands 1000 power-frequency current disconnections. Certification is CE / CMA / CNAS accredited laboratory, and price is Request a quote per project.