Why Suppressors Are Mandatory for Modern Coils
When a contactor coil de-energizes, the collapsing magnetic field generates a voltage spike of 5-10x the supply voltage. This spike destroys nearby electronics and erodes coil insulation over time. Eaton DILM surge suppressors clamp these spikes, extending coil life by 3-5x and protecting adjacent PLCs, sensors, and control electronics.
1. Varistor Suppressors (XTCEXVSBW / VSCA / VSCC / VSCD)
For AC coils. Voltage-clamping varistor technology:
- XTCEXVSBW — Varistor suppressor, 24-48VAC
- XTCEXVSCA — Varistor suppressor, 110-130VAC
- XTCEXVSCC — Varistor suppressor, 130-240VAC
Wholesale: $15-22/pc. MOQ 100. Voltage range 24-415VAC.
2. RC Suppressor (XTCEXRSBB)
For AC coils where varistor isn't enough. RC snubber network:
- XTCEXRSBB — RC suppressor, 110-240VAC
Wholesale: $25/pc. Best for highly inductive circuits with long cable runs.
3. Free-Wheel Diode (XTCEXDSB)
For DC coils. Bidirectional transient suppression:
- XTCEXDSB — Free wheel diode suppressor, 24-250VDC
Wholesale: $12/pc. Standard for all DC coil contactors.
4. Motor Suppressor Module (XTCEXMSMB)
For motor-side protection. Limits dv/dt at motor terminals:
- XTCEXMSMB — Motor suppressor module
Wholesale: $35/pc. Reduces motor bearing currents and insulation stress.
5. Selection Table
| Type | Best For | Price |
|---|---|---|
| Varistor | AC coils 24-415VAC | $15-22 |
| RC | High-inductance AC circuits | $25 |
| Free-Wheel Diode | DC coils 24-250VDC | $12 |
| Motor Module | Motor-side dv/dt | $35 |
6. Contact RF Mando
- Email: Joanna@rfmando.com
- WhatsApp/Telegram: +86 189 6031 3731
- Website: https://www.rfmando.com/
All suppressors in stock at RF Mando Xiamen. UL/CSA/IEC/CE certified. MOQ 100. Lead time 15 days. Payment: T/T 30/70. Sample program available for bulk orders.