21.311.1257.0 is a modular electrical connector terminal strip designed for secure industrial electrical connections with integrated wire protection (DSI - Dielectric Strength Insulation). This product features a 12-pole configuration with 117 mm overall width (G) and 110 mm terminal spacing (T), supporting 20 A rated current per UL/CSA standards with 6 E and 10 E screw terminals. The terminal strip is constructed with zinc-plated steel clamping body and tin-plated E-copper contact clips, rated for 300 V operation (600 V with optional PVC insulating spacer), and includes insulating housing made from PA 6/66 material (UL 94-V-0). This connector is widely used in control panels, industrial automation systems, and power distribution applications where reliable, space-efficient interconnections and protection against accidental wire contact are essential.