5-1437644-4 is a dual-barrier terminal block series 4DB designed for secure electrical connections in industrial and electronic applications. It features a 0.325" (8.255 mm) pitch with support for 2 to 30 circuits, accommodating wire gauges from 12 to 22 AWG. The block is rated for UL Class C 20 Amps at 150V and UL Class D 10 Amps at 300V, with CSA certifications for multiple voltage and current ratings. The housing is constructed from thermoplastic polyamide with UL94V-0 flammability rating, and terminals are bright acid-tin copper alloy with #6-32 steel screws featuring zinc plating and clear chromate coating. Operating temperature range extends to 105°C maximum, with recommended PCB hole diameter of 1.7 mm and maximum tightening torque of 7 in.-lbs. This terminal block is ideal for panel-mount applications requiring reliable, modular electrical distribution in control systems, power distribution panels, and industrial equipment.