The Suntree AC Surge Protector (SPD) 40kA 4 Pole Three Phase is a Type 2 modular surge arrester designed to protect three-phase AC distribution systems, commercial panels, and solar inverter AC output circuits from power surges and transient overvoltages.

Technical Specifications

Poles: 4P (3 Phase + Neutral)
SPD Class: Type 2 / Class II (suitable for sub-panels and downstream distribution boards)
Maximum Discharge Current (\(I_{max}\)): 40kA (8/20µs wave)
Nominal Discharge Current (\(I_{n}\)): 20kA (8/20µs wave)
Maximum Continuous Operating Voltage (\(U_{c}\)): 385V AC to 420V AC (system configurations typically cover standard 415V three-phase setups)
Voltage Protection Level (\(U_{p}\)): < 1.8kV
Response Time (\(t_{A}\)): < 20ns
Mounting Type: Standard 35mm DIN rail
Ingress Protection: IP20
Working Temperature: -40°C to +80°C

Suntree AC Surge Protector (SPD) 40kA 4 Pole Three Phase Key Features

Pluggable Modular Design: Individual phase or neutral modules can be hot-swapped and replaced seamlessly without removing the entire base or disconnecting the main power.
Visual Status Windows: Features clear fault-indicator viewports on each module. Green indicates normal working condition, while Red signals that the surge capacity is exhausted and the module must be replaced.
Thermal Safety Disconnection: Outfitted with an internal thermal trip mechanism that safely isolates the SPD module from the live circuit if it overheats or breaks down under extreme surge conditions.
Housing Material: Durable, high-grade, V0 flame-retardant thermoplastic designed to prevent fire propagation.

Suntree AC Surge Protector (SPD) 40kA 4 Pole Three Phase Wiring & Installation Overview

Parallel Connection: The SPD must be wired in parallel to your main incoming supply lines (after a dedicated backup miniature circuit breaker or fuse disconnect).
Terminal Connections:
- Connect phase lines to the L1, L2, and L3 terminals.
- Connect the neutral line to the N terminal.
- Connect the grounding terminal marked PE directly to your distribution board’s main earth bar.
Cable Length Rule: Keep all connecting leads (L1, L2, L3, N, PE) as short and straight as possible (under 50 cm total ) to minimize inductive voltage drops during a fast-acting surge event.