Hager SPE340 Type 2 Surge Protective Device, 3-Pole, TNS/TT, 275V, 20kA, 40kA Imax

Electricians and panel builders install the Hager SPE340 in low-voltage distribution boards to protect three-phase TN-S and TT networks from transient overvoltages. This Type 2 surge protective device is a varistor-based unit that limits voltage spikes to safe levels, safeguarding downstream equipment such as inverters, HVAC systems, and industrial controls.

Key specifications

• Type 2 surge protective device (SPD) per IEC 61643-11
• 3-pole configuration for TN-S and TT systems
• Maximum continuous operating voltage (Uc): 275 V AC
• Nominal discharge current (In): 20 kA (8/20 µs)
• Maximum discharge current (Imax): 40 kA (8/20 µs)
• Voltage protection level (Up): ≤ 1.5 kV
• Technology: metal oxide varistor (MOV)
• Mounting: 35 mm DIN rail, width 3 modules (54 mm)
• Status indication: visual flag (green/red)
• Short-circuit withstand capability: 50 kA
• Operating temperature: -40°C to +80°C
• Degree of protection: IP20
• Connection cross-section: solid 2.5–35 mm², flexible 2.5–25 mm²

Why choose it

The SPE340 combines high discharge capacity with a compact 3-module design, making it suitable for standard distribution boards. Its visual status flag allows quick inspection without test equipment, and the wide operating temperature range ensures reliable performance in harsh environments.

Ideal use cases

• Protection of three-phase main distribution boards in commercial and industrial buildings
• Surge protection for TN-S and TT earthing systems
• Installation upstream of sensitive equipment such as PLCs, drives, and measurement devices

Good to know

The device is designed for DIN rail mounting and requires a 3-module space. It is a Type 2 SPD intended for installation at the origin of the installation or in sub-distribution boards, in accordance with local regulations.