AC SPD 
AC SPD 1P 275V / 385V House Surge Protective Arrester
1 Pole 20kA - 60kA DIN Rail 35mm Uc 275V/385V
T1 + T2 PV 
T1+T2 Solar DC SPD 1000V / 1200V 8/20μs & 10/350μs Arrester
DC 1000V/1200V Iimp 7kA Imax 50kA Solar PV Array
Heavy Duty 
High Current AC SPD 1P 120kA / 160kA / 200kA Telecom Grade
Up to 200kA 385V AC High Energy MOV Base Stations
DC 1200V 
DC 1200V 3P Photovoltaic Surge Protective Device (20-40kA)
1200V DC In 20kA Imax 40kA PV Inverter
Multi-Voltage 
Modular DC SPD 500V / 600V / 800V / 1000V 10kA-40kA
500V-1000V 20-40kA Replaceable Cartridge CE Compliant
2P Solar 
2P DC SPD 500V–1000V DIN Rail Solar Power Protector
2 Pole 20-40kA Outdoor Enclosures RoHS / CE
Standard DC 
DC SPD 1000V 800V Low-Voltage Photovoltaic Surge Arrester
10kA~20kA 20kA~40kA Thermal Disconnect Plug-in Module
3-Phase AC 
Three-Phase 3P AC 385V T1+T2 7kA/50kA Lightning Arrester
3-Phase 3W 10/350μs 7kA 8/20μs 50kA Main Switchboard
EV / PV Box 
2P / 3P DC Solar SPD for PV Combiners & EV Charging Piles
2P / 3P Options 500V-1000V EV Charging Compact Body
NPE Spark Gap 
NPE Spark Gap Discharge Tube Module 20-50kA for TT / TN-S
TT / TN-S Mode Zero Leakage High Arc Quenching 220V / 385V
1P + NPE 
AC 1P+NPE Shield-Type SPD 275V/385V Differential Protection
1P + NPE Differential Mode Fault Indication T1 / T2 Combined
Spare Part 
TOV1 Replacement Module Cartridge Inserts (275V/385V/420V)
Quick Plug-in 10kA-30kA Cost Saving Hot Swappable
Engineering Principles & Selection Guide for Surge Protective Devices (SPD)
Transient overvoltages generated by atmospheric lightning strikes or industrial inductive load switching can destroy sensitive electronic components within microseconds. At Zhejiang TMB Electric Co., Ltd., we manufacture high-capacity Metal Oxide Varistor (MOV) and Gas Discharge Tube (GDT) / Spark Gap technologies that meet IEC 61643-11 (Low-voltage surge protective devices - Part 11) and IEC 61643-31 (SPDs for photovoltaic installations).
When engineering low-voltage protection systems for international infrastructure projects, distributors and electrical panel builders must consider key selection criteria:
- Continuous Operating Voltage (Uc / Ucpv): The rated maximum continuous voltage must exceed the maximum operating voltage of the network by at least 10% to 20%. For solar PV strings, calculate the open circuit voltage (Voc) at lowest ambient temperatures to prevent premature thermal runaway.
- Nominal & Maximum Discharge Current (In / Imax): In (8/20 μs wave) confirms device endurance under repeated surges, while Imax denotes the ultimate single-event discharge capacity without destruction.
- Voltage Protection Level (Up): Ensure that Up is substantially lower than the impulse withstand voltage rating (Uw) of downstream equipment (e.g., inverters, EV charger controller boards, PLCs).
- Neutral-to-Earth Protection (NPE): In TT and TN-S grounding schemes, spark-gap-based NPE modules isolate the neutral from earth under normal conditions, completely eliminating continuous earth leakage currents.
Standard Product Matrix Overview
| Series | System Type | Rated Voltage (Uc) | Discharge (In / Imax) | Response Time | Standard Compliance |
| AC Standard (1P-4P) | AC Single / Three Phase | 275V / 385V / 420V AC | 20kA / 40kA - 60kA | < 25 ns | IEC 61643-11, CE |
| PV High-Voltage DC | Solar DC String / Battery | 500V, 800V, 1000V, 1200V DC | 20kA / 40kA | < 25 ns | IEC 61643-31, CE |
| T1+T2 Heavy-Duty | AC Main Incomer / PV Main | 385V AC / 1200V DC | Iimp 7kA (10/350μs) / 50kA | < 25 ns | Class I + II Certified |
| NPE Spark Gap | N-PE Path (TT / TN-S) | 255V / 385V AC | 20kA / 50kA | < 100 ns | IEC 61643-11 |
Require Tailored Voltage or Private Label SPD Manufacturing?
Our engineering team in Liushi, Wenzhou provides custom Uc ratings, custom terminal configurations, OEM laser logo printing, and full batch inspection reports before dispatch.