Decrease maintenance costs, increase contact reliability/dependability, and reduce destructive dc circuit overvoltages by applying the self-powered SEL-9501 Arc Suppressor to dc circuits.
Improved Reliability—Eliminate the single largest failure mode of protective relays, and prevent contact welding caused by the inadvertent interruption of the tripping current by relay contacts that are not rated for such high currents.
Breaker Contact Wear Reduction—Eliminate electrical wear in circuit breaker 52a/52b contacts. SEL-9501 Contact Arc Suppressor shunts current around the opening contact. It then interrupts the current and dissipates the energy internally instead of damaging contacts.
All-Inclusive Protection—Protect many other contact types, such as trip, close, lockout coil, auxiliary, and control switches. The SEL-9501 should not be used with reed relays.
The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.