The "U" designation typically refers to Honeywell Tradeline packaging

While the MPR-5613 is a base model

preventing unprotected airflow

and R76716900

This model serves as the modern

Robertshaw 6000-105 Vibra Switch Els PW 29614 The "U" designation typically refersThe Robertshaw 6000 105 Vibra Switch is a high precision vibration detection switch designed for heavy duty protection of rotating and reciprocating machinery. Engineered for critical HVACR and industrial applications, this explosion proof vibration switch (X PRF) features a rugged aluminum housing rated for Class I, Groups C & D and Class II, Groups E, F & G hazardous locations. This unit utilizes a Single Pole Double Throw (SPDT) contact