Testing
SEL manufactures testing equipment designed for testing protective relays and communications equipment.
- SEL-4000 Relay Test System

The SEL-RTS Relay Test System is designed for testing protective relays having low-level test capabilities. The system consists of the SEL-AMS Adaptive Multichannel Source and either the SEL-5401 or SELTEST™ software.
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- SEL-4388 Mirrored Bits Tester

The SEL-4388 gives engineers and technicians the power to accelerate commissioning and bench testing, and to improve cable identification, training, and maintenance.
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- SEL-2505PB Mirrored Bits Interface

Communicate 5 kilometers and transfer hardware flow-control signals with port-power or external power.
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