Mersen STPT2-40K320V-4P Surge Protection Device

The Mersen STPT2-40K320V-4P Surge Protection Device is engineered for dependable power protection in industrial and commercial electrical systems. Designed as a Type 2/Class II SPD, it safeguards sensitive equipment from transient voltage surges and switching disturbances. With a maximum discharge current (Imax) of 40kA (8/20μs), it provides robust secondary protection, perfectly suited for installations that already feature Type 1 devices upstream—or as the primary defense in areas without direct lightning exposure. Its DIN-rail mount, pluggable module format, and clear visual status indication make it user-friendly and efficient for modern electrical panels.

⚙️ Key Features at a Glance

• SPD Type: Type 2 / Class II (IEC 61643-11 compliant)

• Maximum Discharge Current (Imax): 40 kA (8/20 µs)

• Nominal Discharge Current (In): 20 kA

• Rated Voltage: 277/480V AC (3Ph+N, TNS system)

• Configuration: 4-Pole, 4 Modules (4+0)

• Indication System: Green (OK) / Not Green (Replace)

• Mounting Type: DIN Rail (Pluggable format)

• Short Circuit Withstand: 25 kA (ISCCCR)

• VPR Ratings: L-G 1000V / L-L 2000V / N-G 1000V / L-N 2000V

• Max Back-Up Fuse: 125A gG

• Material: PA66 CT1 (High-quality Thermoplastic)

• ROHS Compliant & UL Type 2 Assembly

💡 Why Choose This Product

Choose Mersen STPT2-40K320V-4P for proven reliability and safety in surge protection. Backed by Mersen’s global expertise, this SPD is ideal for preventing downtime and equipment damage due to transient voltages. Its pluggable cartridge design simplifies maintenance and replacement, while the visual status window ensures real-time monitoring. With a compact 4-module form factor, it integrates seamlessly into your electrical panels — offering peace of mind and long-term durability.

🏭 Ideal For

• Industrial and commercial distribution boards

• Control panels and automation systems

• Building management systems (BMS)

• Data centers and telecom equipment

• Secondary protection for Type 1 SPD-equipped facilities

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❓ FAQs

Q1: What type of surge protection does this device provide?
A1: It’s a Type 2/Class II SPD, ideal for secondary protection after Type 1 devices.

Q2: Is it suitable for 3-phase power systems?
A2: Yes, it supports 3Ph+N (TNS) systems at 277/480V AC.

Q3: Can I replace individual modules?
A3: Yes, the design is pluggable, allowing for easy replacement of spent modules.