1492-J line is designed for safety, installation ease and ruggedness. Features using these design criteria include the following: Tin-plated terminals and steel screws for corrosion resistance. High copper content copper alloy for excellent conductivity. Four-sided wire funnel guides for easy wire insertion. Finger-safe housings to prevent accidental contact with live circuits. International approvals for worldwide use. DIN Rail (Cat. No. 199-DR1) mountability, allowing terminal blocks to be placed on the same channel as contactors, starters, relays and other DIN Rail-mounted control devices. Self-extinguishing, polyamide 6.6 housing material with UL 94-V0 flammability rating. Backed out screws for fast wiring.