1S26

General information

SKU

1S26

Short Description

Arc Fault Monitor – 4 Zones, 8 Sensors

Long Description

Arc fault protection is a technique for the fast clearance of arcing faults on busbars and within metal-clad switchgear and cable boxes. The arc is detected by an optical sensor, with the signal fed to a device that also monitors load current. A trip can be achieved in under 10 ms using arc detection alone, or within 15 ms with the integrated instantaneous overcurrent check, far faster than traditional IDMT relays. The 1S26 Arc Fault relay suits new or existing medium voltage busbar systems with up to two incoming lines, and can also protect outgoing feeders.

Quantity

Features

Four independent high speed arc fault tripping zones
1 or 2 arc fault sensors per zone allowing up to 8 arc fault sensors per 1S26 module
Blocking status input for each arc fault zone
Trip indication LED for each arc fault zone
Continuous arc sensor supervision with sensor fail LED for each zone
Non volatile memory ensures last recorded alarm states are restored on power up
Integrated 3 phase overcurrent check function

Application

The 1S26 Series relays provide high-speed arc protection for medium and high voltage busbar applications. An adjustable three-pole AC current check stage ensures system security while maintaining high-speed clearance of arc faults. Up to eight 1S30 Arc Detectors may be connected to each 1S26 relay. The fast overcurrent reset characteristic also allows the 1S26 to perform CB-fail protection on the incoming feeder of the monitored bus, with a 2T105 relay providing the CB-fail time delay.

1s26-m.pdf

1s26-user-guide.pdf