TE Connectivity KHAU-17A18-120 Electromechanical Relay

TE Connectivity's KHAU-17A18-120 is a 4-form-C (4PDT-CO) panel-mount plug-in electromechanical relay for general-purpose power switching in industrial control systems. The AC coil is rated at 120 VAC and draws 1.35 VA, with a coil resistance of 3,900 ohms. Each of its four Form C contacts can switch up to 2.5 A at up to 240 VAC, with silver (Ag) contact material and gold plating for reliable operation. The relay body weighs about 45 g and features a dust-protected enclosure, designed for panel and socket mounting with solder terminals for both coil and main contacts. Insulation ratings include 100 MΩ initial resistance between coil and contacts, and 1,500 Vrms dielectric withstand between adjacent contacts and between contacts and coil. Operating temperature range is -45 to 70 C. Dimensions are 28.17 mm (L) × 21.82 mm (W) × 32.54 mm (H). Packaging is tray-based. The device is part of TE Connectivity's Potter & Brumfield line and carries TE's documented agency approvals, including UL. Typical applications include industrial control panels, multi-pole signaling, and interlock circuits where multiple poles switch together.