Sertec is a stocking location of the Schweitzer type SEL 421 Relay, Catalog Number: 042126152B4B4H26XX. We are also setup to recondition, repair, and re-calibrate your existing type SEL 421 Relay. All Schweitzer type SEL 421 Relay comes with a full one year warranty.
Please send us an email inquiry at sertec@cbsalesne.com or call us 24/7. Call 203-888-7500!