Created by: Glen Zhu | Updated Date: October 22nd, 2024
Main Switch (ACB / MCCB / MCB) | Dedicated MCCB / MCB or Fuse | Surge Protective Device (SPD) | ||||||
MCCB / MCB | Fuse | TN-S Network | TN-C Network | TT Network | ||||
Single Phase | 3 Phase | Single Phase | 3 Phase | Single Phase | 3 Phase | |||
ACB ≥ 630A MCCB: 630A ~ 315A | 200A | 315A ~ 250A | Type 1 SPD FLP25-275/1(S), FLP25-275/2(S), FLP25-275/1(S)+1 | Type 1 SPD FLP25-275/4(S), FLP25-275/3(S)+1 | Type 1 SPD FLP25-275/1(S) | Type 1 SPD FLP25-275/3(S) | Type 1 SPD FLP25-275/1(S), FLP25-275/1(S)+1 | Type 1 SPD FLP25-275/3(S)+1 |
MCCB: 400A ~ 200A | 125A ~ 100A | 125A | Type 1+2 SPD FLP12,5-275/1(S), FLP12,5-275/2(S), FLP12,5-275/1(S)+1 | Type 1+2 SPD FLP12,5-275/4(S), FLP12,5-275/3(S)+1 | Type 1+2 SPD FLP12,5-275/1(S) | Type 1+2 SPD FLP12,5-275/3(S) | Type 1+2 SPD FLP12,5-275/1(S), FLP12,5-275/1(S)+1 | Type 1+2 SPD FLP12,5-275/3(S)+1 |
MCCB: 200A | 80A ~ 50A | 80A | Type 1+2 SPD FLP7-275/1(S), FLP7-275/2(S), FLP7-275/1(S)+1 | Type 1+2 SPD FLP7-275/4(S), FLP7-275/3(S)+1 | Type 1+2 SPD FLP7-275/1(S) | Type 1+2 SPD FLP7-275/3(S) | Type 1+2 SPD FLP7-275/1(S), FLP7-275/1(S)+1 | Type 1+2 SPD FLP7-275/3(S)+1 |
MCCB: 100A ~ 63A | 40A ~ 32A | 40A ~ 32A | Type 2 SPD SLP40-275/1(S), SLP40-275/2(S), SLP40-275/1(S)+1 | Type 2 SPD SLP40-275/4(S), SLP40-275/3(S)+1 | Type 2 SPD SLP40-275/1(S) | Type 2 SPD SLP40-275/3(S) | Type 2 SPD SLP40-275/1(S), SLP40-275/1(S)+1 | Type 2 SPD SLP40-275/3(S)+1 |
MCB: 32A | 20A | 20A | Type 2+3 SPD SLP20-275/1(S), SLP20-275/2(S), SLP20-275/1(S)+1 | Type 2+3 SPD SLP20-275/4(S), SLP20-275/3(S)+1 | Type 2+3 SPD SLP20-275/1(S) | Type 2+3 SPD SLP20-275/3(S) | Type 2+3 SPD SLP20-275/1(S), SLP20-275/1(S)+1 | Type 2+3 SPD SLP20-275/3(S)+1 |
/ | 16A ~ 10A | 16A ~ 10A | Type 3 SPD TLP-275/2(S) | Type 3 SPD TLP-275/2(S) | Type 3 SPD TLP-275/2(S) |
According to the above table, We can quickly select the appropriate surge protection device through the main circuit breaker, making it very simple to choose a surge protection device.
2. At the outgoing distribution box, if main circuit breaker is between 200 A and 400 A, the upstream dedicated disconnector of SPD should use a 100~125 A circuit breaker or a 125 A fuse. SPD can be selected Type 1+2 SPD FLP12,5 series.
4. At the sub-distribution box, if main circuit breaker rated at 63~100 A, the upstream dedicated disconnector of SPD should use a 32~40 A circuit breaker or fuse. SPD can be selected Type 2 SPD SLP40 series.
5. At the sub-distribution box, if the main circuit breaker is 32 A, the upstream dedicated disconnector of SPD should use a 20 A circuit breaker or fuse. SPD can be selected Type 2+3 SPD SLP20 series.
6. At the sub-distribution box, for surge protection of industrial control equipment, the upstream dedicated disconnector of SPD should use a 10~16 A circuit breaker or fuse. SPD can be selected Type 3 SPD series.
LSP’s reliable surge protection devices (SPDs) are designed to meet the protection needs of installations against lightning and surges. Contact our Experts!
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