1. Substitution Conclusion for 100DP3T1B1M1QEH Based on core electrical specifications, mounting dimensions, and fundamental mechanical construction, the 100DP3T1B1M1QEH can serve as a direct replacement for the original part number (7203P3YZGE). The two parts are identical in circuit configuration (DPDT On-Off-On), rated electrical parameters (5A 120V AC / 28V DC), panel cutout (6.35mm), mounting thread (1/4-40), terminal type (solder lug, epoxy-sealed), and electrical endurance. The sole deviation lies in the actuator. The original part features a flat anti-rotation actuator with a length of 11.43mm, whereas the substitute part uses a standard round actuator measuring 10.41mm. This difference has two practical implications: First, the substitute's actuator will rotate when the mounting nut is tightened, complicating panel installation and alignment of panel markings. The original's flat-head design allows it to be held securely with a tool, enabling easier and more reliable installation. Second, the approximately 1mm reduction in actuator length will slightly affect the protrusion height above the panel and the tactile feel during operation. If the application does not strictly require the anti-rotation feature and the minor aesthetic/manual difference is acceptable, this part can be successfully substituted.