Auxiliary contacts are electrical switching devices used in industrial control systems to provide additional control signals, status indication, or interlocking functions for main power contactors.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Mounting Type | Snap-on, screw, or DIN rail | |
| Rated Current | 5A to 10A at 240V AC | |
| Rated Voltage | Up to 600V AC/DC | |
| Electrical Life | 1,000,000 operations minimum | |
| Mechanical Life | 10,000,000 operations minimum | |
| Contact Resistance | <50 mΩ | |
| Dielectric Strength | 2500V AC for 1 minute | |
| Contact Configuration | NO, NC, CO (1NO1NC, 2NO, 2NC, etc.) | |
| Insulation Resistance | >100 MΩ at 500V DC | |
| Operating Temperature | -25°C to +70°C |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
An electromechanical switch used to control the main power supply to electrical equipment by making or breaking the circuit.
A protective device in motor starters that monitors current flow and disconnects the motor circuit when excessive current is detected, preventing motor damage from overloads.
A specialized electrical device designed to monitor safety-critical functions and ensure safe operation of machinery by controlling safety circuits.
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Normally open (NO) contacts remain open when the main contactor is de-energized and close when energized. Normally closed (NC) contacts remain closed when de-energized and open when energized. NO contacts are typically used for status indication or starting auxiliary circuits, while NC contacts are used for safety interlocking or stop circuits.
Yes, most industrial contactors are designed with modular auxiliary contact blocks that can be snapped onto the main contactor body. These add-on blocks provide additional contacts without requiring complete contactor replacement. The number of add-on blocks is limited by the contactor design and manufacturer specifications.
Regular inspection for contact erosion, cleaning of contact surfaces with appropriate solvents, checking for proper mechanical operation, and verifying electrical continuity. Contacts should be replaced when erosion exceeds 50% of the original thickness or when contact resistance increases significantly.
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