AS350R550

Overview

The AS350R550 is a negative temperature coefficient (NTC) thermistor inrush current limiter from the MegaSurge MS35 series. It provides surge protection for input energies between 250 and 1000 joules. The component features a resistance of 500 mOhms with a tolerance of ±25% and a steady-state current rating of 50 A. It supports voltage ratings of 120 VAC, 240 VAC, 480 VAC, and 680 VAC. Physical dimensions include a diameter of 37 mm and a width of 9 mm, with a lead pitch of 19 mm.

Feature Summary

• Provides inrush current limiting for high-energy applications up to 1000 joules
• Serves as a single-component alternative to wire-wound resistors combined with timers or relays
• Supports multiple AC voltage ratings including 120 VAC, 240 VAC, 480 VAC, and 680 VAC

Applications

• Power supply input stages
• Industrial control systems
• Consumer electronics power inputs

Procurement Notes

Verify that the specific part number suffix matches the required resistance and current specifications. Confirm package type and lead configuration compatibility with the target PCB footprint. Ensure thermal management requirements align with the component's dissipation characteristics during operation.

Selection Notes

Select this component when designing circuits requiring robust inrush protection for energies up to 1000 joules. Consider the 50 A steady-state current capability and low initial resistance for efficient power delivery after startup. Verify voltage ratings against the maximum line voltage present in the application environment.

Part Context

This device belongs to the Vishay Ametherm MegaSurge MS35 series of inrush current limiters. These components are designed to replace complex resistor-timer-relay assemblies with a simpler, reliable NTC thermistor solution. The series offers various resistance and current options to suit different power levels.

FAQ

What is the maximum input energy this component can handle?

The AS350R550 provides inrush current protection for input energies ranging from 250 to 1000 joules.

Does this component replace traditional relay-based solutions?

Yes, it serves as a simple one-component alternative to using wire-wound resistors with timers and relays.