AC Surge Protective Devices (AC SPD)

Engineered by Zhejiang TMB Electric Co., Ltd. — High-energy metal oxide varistors and spark gap modules for reliable transient overvoltage protection in TN, TT, and IT low-voltage power networks.

Low-Voltage AC Surge Protectors & Modules

Showing specialized industrial & residential models · MOQ 5 pcs
CE Marked 1P AC Surge Protector 275V 385V 20kA 40kA 60kA

1P AC SPD 275V / 385V Low-Voltage Surge Arrester (20kA - 60kA)

1-Pole Type 2 / Class II 35mm DIN Rail
$1.41 - 1.75 Min. Order: 5 pcs
Inquire Specific Ratings
High Current 1P AC SPD 120kA 160kA 200kA for Telecommunication

1P Heavy-Duty Telecom AC SPD 385V (120kA / 160kA / 200kA)

High Energy MOV Telecom Grade TZG40-160
$5.08 Min. Order: 5 pcs
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Type 1 + 2 Three Phase 3P AC385V T1 T2 Surge Protective Device

3P 3-Phase 3-Wire T1+T2 Lightning Arrester (10/350µs 7kA, 8/20µs 50kA)

3-Phase 3-Wire Class I+II AC 385V
$10.80 Min. Order: 5 pcs
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Compact 1P AC SPD 20kA to 60kA 275V 385V 420V

1P AC SPD 20kA–60kA House Surge Protective Device (275V / 385V / 420V)

DIN Rail Pluggable Fast Clamping Visual Window
$1.80 - 2.08 Min. Order: 5 pcs
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Replacement TOV1 Replacement Module Cartridge for AC SPD

TOV1 Replacement Cartridge Inserts for AC SPD (275V / 385V / 420V)

Pluggable Core Thermal Disconnector Maintenance Part
$0.98 - 1.23 Min. Order: 5 pcs
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Spark Gap NPE Spark Gap Module Discharge Tube

NPE Spark Gap Gas Discharge Module (20kA–50kA, TT / TN-S Neutral Protection)

N-PE Isolation Zero Leakage High Withstand
$4.43 - 8.86 Min. Order: 5 pcs
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18mm Slim 1P+N 18mm Compact AC Surge Protector

1P+N 18mm Slimline Single-Phase AC SPD (20kA–40kA, 275V)

1P+N 1-Module Space Saving Home Board
$6.36 Min. Order: 5 pcs
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3-Phase Three Phase Shield Type AC Surge Protector 3P

3P Shield-Type Three-Phase AC Surge Arrester (275V / 385V / 420V T2)

3-Pole AC Fault Indicator Pluggable MOV
$5.01 - 5.97 Min. Order: 5 pcs
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4-Pole 4P AC SPD MOV Shield Type Replaceable Surge Device

4P 3-Phase + Neutral Pluggable AC SPD (10-20kA / 20-40kA / 30-60kA)

4-Pole TN-S Full Protection Status Flag
$6.69 - 8.12 Min. Order: 5 pcs
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Engineering Insights

Technical Criteria for Low-Voltage Surge Arrester Selection

Surge protective devices are safety-critical elements in electrical distribution networks. Ensuring operational reliability depends on properly aligning network characteristics with device specifications.

Earthing Schemes & Pole Configurations

Selecting an AC SPD requires understanding the facility earthing design:

  • TN-C Systems: Use 3P surge arresters protecting L1, L2, and L3 connected directly to PEN conductors.
  • TN-S Systems: Require 4P (or 3P+N) configurations with separate protective earth (PE) and neutral (N) paths.
  • TT Networks: Implement "3+1" or "1+1" designs utilizing varistors across lines to neutral, combined with a high-capacity NPE spark gap module from neutral to earth to avoid continuous leakage current.

Continuous Voltage (Uc) & Protection Level (Up)

Two essential electrical ratings govern SPD life expectancy and load safety:

  • Maximum Continuous Operating Voltage (Uc): Must safely exceed the network supply tolerance (e.g., 275V for 230V mains; 385V to 420V for regions subject to unstable grid swells or neutral shifts).
  • Voltage Protection Level (Up): The residual clamping voltage under surge impulse must remain substantially lower than the impulse withstand category (Uw) of downstream electronics (typically Up ≤ 1.5 kV to 2.0 kV).
Technical Reference

Standard AC SPD Performance Matrix

Standard engineering parameter guidelines across Zhejiang TMB Electric Co., Ltd. DIN rail surge arrester series.

Class / Type Standard Applied Nominal In (8/20µs) Max Imax (8/20µs) Voltage Level Up Recommended Location
Type 1 / Class I IEC 61643-11 25 kA – 50 kA 100 kA (Iimp 12.5–25kA) ≤ 2.5 kV Main Service Incomer / External Lightning Rod Sites
Type 1+2 Combination IEC 61643-11 20 kA – 40 kA 50 kA (Iimp 7kA) ≤ 2.0 kV Building Main Distribution Boards (MDB)
Type 2 / Class II IEC 61643-11 10 kA – 20 kA 20 kA – 60 kA ≤ 1.5 kV – 1.8 kV Sub-distribution Panels / Branch Circuits
NPE Spark Gap IEC 61643-11 20 kA – 50 kA 50 kA – 100 kA ≤ 1.5 kV Neutral-to-Earth connection in TT & TN-S systems
Procurement FAQ

Common Inquiries from Global Electrical Contractors & Importers

What is the difference between an AC SPD and a DC SPD?
AC SPDs are designed specifically for alternating current circuits where voltages alternate sinusoidal polarities with natural zero-crossings. DC SPDs are intended for solar photovoltaic arrays or DC battery storage systems. Because direct currents lack zero-crossing behavior, internal disconnectors in DC SPDs require specialized magnetic blowout features to safely extinguish continuous arcs. Never use an AC SPD in a DC string.

How do the visual status indicators and remote signaling operate?
Each replaceable module integrates an internal thermal disconnection mechanism. Under continuous overcurrent or multiple extreme transient events, the solder barrier triggers release to prevent thermal runaway. The front mechanical indicator changes from Green (Normal Protection) to Red (Fault/Expired). Models with remote signaling contacts (FM) incorporate dry auxiliary contacts to signal alarm states to a central PLC or BMS system.

Does Zhejiang TMB Electric Co., Ltd. offer custom branding and OEM packaging?
Yes. We offer comprehensive OEM/ODM manufacturing. Options include custom silk-screen logos, unique model series labeling, tailored tripping and discharge specifications, barcoding, and private label carton packaging. Factory audits and test certifications are supplied upon request.

Need Custom Quotations or Technical Datasheets?

Connect directly with our engineering team in Liushi, Wenzhou. We supply bulk component pricing, sample validation, and full technical compliance documentation for international tenders.

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