Surge protective device type 1+2 (B+C) SPBT12-280-3+NPE50 184750

Surge protection for electrical installations

This surge arrester from Eaton, model SPBT12-280-3+NPE50, is a key element ensuring the safety of the electrical installation and the devices connected to it. The device effectively reduces the effects of both direct lightning strikes and indirect surges resulting from the operation of devices in the network. It is a universal solution designed for use in residential, commercial and industrial buildings.

The Class 1+2 arrester (formerly B+C) protects against surges in TN-S, TT, TN and other network systems. Its construction based on a spark gap and varistor ensures a quick response to sudden voltage increases, and the optical indication of damaged inserts facilitates control of the device's status. The use of this type of arrester is particularly important in places exposed to frequent voltage changes or connection of sensitive electronic equipment.

Characteristics and application

The SPBT12-280-3+NPE50 arrester is designed for mounting on a DIN TH-35 mm mounting rail. Its 4 modules take up little space in the switchgear cabinet. The surge current at 12.5 kA and the specific energy of 625 kJ/Ohm guarantee effective protection against large surges. The ability to replace inserts allows for quick restoration of full device functionality after a failure. Additionally, it is possible to add a signaling contact for remote monitoring of the arrester's status.

Thanks to the high level of protection (1.5 kV L-PE, 1.5 kV L-N, 1.4 kV N-PE) and compliance with IEC 61643‑1+A1 standard, this arrester meets stringent requirements regarding safety and reliability. This is particularly important in installations requiring a high level of protection against power supply disturbances. The maximum wire cross-section of 25 mm² (solid/stranded) and 35 mm² (flexible) ensures easy connection to the existing electrical installation.

Advantages and benefits

• Versatility: Suitable for different types of networks (TN-S, TT, TN, others).
• Effective protection: Protects against atmospheric and switching surges thanks to the combination of a spark gap and varistor.
• Easy diagnostics: Optical indication of insert damage facilitates quick problem identification and replacement.
• Expandability: The possibility of adding a signaling contact increases the functionality of the device.
• Replaceable inserts: Allow for quick restoration of full efficiency after a failure without having to replace the entire arrester.
• Compact dimensions: Occupies only 4 modules on the DIN rail, making it easy to install even in crowded switchgear cabinets.
• Compliance with standards: Meets the requirements of IEC 61643‑1+A1 standard ensuring a high level of safety and reliability.