MS32 0R540-B

Inrush Current Limiters (ICL) Overview

The Vishay Ametherm MS32 0R540-B is a radial leaded inrush current limiter (ICL) from the MegaSurge MS32 series. It features a nominal resistance of 0.5 Ohms with a tolerance of ±25% at 25°C. The component supports a maximum steady-state current of 40 Amps and has a body diameter of 31 mm. Designed for PCB mounting, it accommodates voltages up to 680 VAC. The suffix '-B' indicates outside kinked leads configuration.

Inrush Current Limiters (ICL) Feature Summary

• Provides effective inrush current limiting during power-up sequences
• Utilizes NTC thermistor technology for automatic resistance adjustment
• Features outside kinked leads for secure PCB retention

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Motor drive circuits
• Industrial control systems

Inrush Current Limiters (ICL) Procurement Notes

Verify that the specific '-B' suffix is required for the outside kinked lead configuration, as standard versions lack this feature. Confirm mechanical clearance for the 31 mm diameter body and 40 A current rating against system requirements. Ensure compatibility with the specified voltage ratings before finalizing procurement orders.

Inrush Current Limiters (ICL) Selection Notes

Select this component when a 0.5 Ohm initial resistance is needed for moderate inrush currents up to 40 A. The 31 mm package size offers a balance between thermal mass and board space. Consider the ±25% resistance tolerance for circuit design margins. The radial leaded format simplifies through-hole assembly processes compared to surface mount alternatives.

Inrush Current Limiters (ICL) Part Context

This part belongs to the Vishay Ametherm MegaSurge MS32 series of inrush current limiters. The series provides various resistance and current combinations within a compact cylindrical form factor. The MS32 series is widely used in applications requiring reliable protection against high initial charging currents in capacitive loads.

Inrush Current Limiters (ICL) Replacement Considerations

Standard MS32 0R540 parts without the '-B' suffix have straight leads. Verify if straight leads are acceptable; otherwise, manual bending may be necessary. Cross-reference other manufacturers' ICLs with similar 0.5 Ohm / 40 A specifications if availability is an issue.