Dec 04, 2012 · The 4 Pole Double Throw Relay, Model 4PDR, is a 24 Volt, AC, multi-purpose control relay. The 4PDR is a plastic DIN rail or flush mounted socket and plug-in- relay. The 4 Pole, Double Throw action provides four separate single pole double throw contacts that can be used for a variety of applications. Buy 1 Pcs TL-4100-C-12V DC 12V Coil DPST 6 Pin PCB Electromagnetic Power Relay with fast shipping and top-rated customer service. Newegg shopping upgraded ™
SP and DP refer to single pole and double pole, ST and DT refer to single throw and double throw. Pole refers to the number of circuits controlled by the switch: SP switches control only one electrical circuit. DP switches control two independent circuits (and act like two identical switches that are mechanically linked).