The 20C228 is a hold-down spring accessory used to firmly secure a relay in its socket. It is compatible with a range of sockets designed for KUP, KUEP, KUGP, KUIP, and KUMP relays, including models 27E043, 27E046, 27E067, 27E121, 27E305, 27E415, and 27E419. The 20C228 is held in place by a socket hold-down screw, providing a secure fastening method. This ensures the relay remains properly seated, maintaining reliable electrical connections in applications that may experience vibration or shock.