Littelfuse.com/PSR

© 2022 Littelfuse, Inc.

Rev: 042722

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PSR SERIES HIGH-SPEED SQUARE BODY

Specifications

Voltage Range

Ac: 450 V–1300 V

Dc: 450 V–1000 V

Amperage Range

40 A–2250 A

Interrupting Range

Ac: 100 kA–200 kA

Dc: 150 kA

Time Constant

10 ms at IR

Microswitch

Yes

Mounting

Flush-end style

Material

Body: ceramic

Contacts: plated brass

Approvals

UL 248-13 Recognized (File: E71611)

cURus (File: E71611)

CCC*

Applicable Standards

UL248-13, IEC 60269-4 (Class aR)

Environmental

RoHS Compliant, REACH

Operating Temperature

-55 °C to +125 °C

Storage Temperature

Up to +35 °C with relative humidity

<65 %

Country of Origin

Mexico

Description

Littelfuse PSR series high-speed square body fuses are

specially designed for protection of power semiconductor

devices such as diodes, triacs, IGBTs, SCRs, MOSFETs,

and other solid state devices that are typically designed

into power conversion and power conditioning equipment.

Variable frequency drives, inverters, UPS, rectifiers, and

soft-starters are examples of typical equipment designed

with sensitive power semiconductor devices that cannot

withstand any line surge or overcurrent conditions and

require high-speed protection.

Littelfuse POWR-SPEED PSR series products offer

optimized circuit protection at the extremely fast speed

required to protect modern day power conversion devices.

Such products are commonly found in numerous applications

including pulp and paper industries, cranes and heavy-lifting

equipment, processing industries, wastewater treatment

plants, and various large factories and MRO facilities.

Features/Benefits



Best in class dc performance



Extremely current limiting



Superior cycling capability



Global certification cURus, CCC*



Direct bus-bar mount design



Visual and optional microswitch fuse blown indication



Low watt-loss design



Compliance with US and Canadian requirements



Fast-acting Class aR performance

Applications



Power conversion devices (UPS, inverter, rectifiers, drives)



Dc systems (dc common bus, dc injection braking)



Battery protection application (energy storage systems)



Electric vehicle charging stations



Heaters and power supplies

Semiconductor Fuses • Flush End • 40 A–2250 A

S

SERIES CASE

SIZE TERMINATION AMPERAGE

CATALOG

NUMBER

ORDERING

PART NUMBER

PSR

030

FL

0550

PSR030FL0550 PSR030FL0550Z

Ordering Part Number

Catalog Number

PSR 030 FL 0550 Z

Termination

FL - Flush end metric thread

FS - Flush end inches thread

Case Size

30, 31, 32, 33, 70, 71, 72, 73

Amperage

Series

Packing Quantity

Z = (2–3 pcs/box)

Recommended Accessories

Microswitch: MS3H1000C (case size 30 to 33)

MS7H1500C (case size 70 to 73)

Web Resources

Download technical documents: Littelfuse.com/PSR

Note: high-speed fuses are designed for fixed installations. They are not

intended for use in moving vehicle applications.

* Refer to CCC section of Electrical Characteristics table