120 VOLT LUBE OIL MOTOR PROTECTOR 90 SEC Auto Reset. The 3420-104 is designed to replace the obsolete 3420-101 (MC20-1001). The 3420-101 had a non-replaceable, internal fuse for control circuit protection. An inadvertent short in the circuit would cause the internal fuse to fail, requiring the replacement of the complete control. The 3420-104 Uni-Kit contains all the required hardware and instructions to replace MC20-1001 controls with the newer MC20-1101. The 3420-104 Uni-Kit has a field replaceable external fuse for control circuit protection, in the event of output circuit overload. The 3420-104 with the external fuse can be identified by the absence of the "R2" terminal on the control (the "R2" terminal function is now done internally). The 3420-104 Uni- Kit uses a mechanical relay for closure of the "M1-M2" contacts instead of a Triac circuit, which was utilized on the obsolete 3420 101 design. Since the mechanical relay closes "M1-M2" slower than the Triac circuit, unit lockout may occur unless a time delay relay (included) is used in conjunction with the 3420-104 version. This time delay is also available separately - order 30-115. 6 amp replacement fuse also available - order 30-120
Replacement for Trane 13650113-01 and 13650083-01
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