Schneider Electric CA3KN40BD TeSys K Control Relay 4NO 24 V DC Coil Screw Clamp Auxiliary Contactor

The Schneider Electric CA3KN40BD is a TeSys K control relay with 4NO contact composition and a 24 V DC coil, rated 10 A conventional thermal current (Ith) at up to 690 V. It switches AC-15 and DC-13 electromagnetic loads for pilot-circuit control, interlocking and signal duplication, with screw clamp terminals for DIN rail or panel mounting.

Technical Specifications

Certifications & Standards

• CE
• UKCA
• UL
• CSA
• CCC
• EAC
• IEC 60947-5-1

Selection Notes

The 4NO contact composition gives four make contacts for signal duplication where no break contact is required. Pick the 24 V DC coil when the control circuit already runs at that voltage; using a coil voltage matching the existing control transformer tap avoids an extra step-down winding. The DC coil has no inrush surge and a longer 30–40 ms closing time than the AC-coil CA2Kseries, which electronic surge suppression trades for lower steady-state power draw — relevant when the relay is driven from a PLC transistor output or a current-limited 24 V DC rail.