SURGE ARRESTER ÜSM-A

The surge protector ÜSM-A is a Type 3 surge protector. Type 3 surge protectors are used to protect against switching voltages in the circuits of end devices. The surge discharge current is not conducted to PE, so the RCD does not interpret it as a fault current. Fine protection is required if the cable length from the two-stage protection to the electrical device exceeds 10 m (long cables induce surge voltages). Type T3 (Type 3, D) surge protectors are used as fine protection. Installation as a device and group protector directly at the device. Features of the ÜSM-A surge protector:

• Type 3 according to standard EN 61643-11
• model: acoustic operational status indication
• installation method: socket
• response time (ns): <25
• maximum continuous voltage (V): 255
• nominal discharge current (8/20) (kA): 3
• nominal load current (A): 16
• nominal voltage (V): 230
• maximum discharge current (kA): 6
• maximum fuse rating (A): 16
• protection level (kV): <1.3
• protection level conductor/earth (V): 1500
• protection level (N-PE) (kV): <1.5
• protection level (L-N) (kV): <1.3
• protection level (L-N / L/N-PE) (V): <1500 / <1500
• protection level (symmetrical/asymmetrical) (V): <1500 / <1500
• device indication: acoustic
• temperature range (°C): -15 – +60

A wide range of surge protectors and other OBO Bettermann products can be found in the OnnShop and Express store selections, and are worth exploring.

This product description is an automated translation of the original Finnish description.