Littelfuse.com/PSR
© 2024 Littelfuse, Inc.
Rev: 021524
1 of 20
POWR-SPEED
®
Fuse
PSR SERIES HIGH-SPEED SQUARE BODY
Specications
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 cURus Recognized (File: E71611)
CCC (Ac voltage) *
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-SPEE D 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/Benets

Best in class dc performance

Extremely current limiting

Superior cycling capability

Global certication 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, rectiers, 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 xed installations. They are not
intended for use in moving vehicle applications.
* Refer to CCC section of Electrical Characteristics table
Littelfuse.com/PSR
© 2024 Littelfuse, Inc.
Rev: 021524
2 of 20
POWR-SPEED
®
Fuse
PSR SERIES HIGH-SPEED SQUARE BODY
Electrical Characteristics
CASE
SIZE
CATALOG NUMBER
AMPERE
RATING (A)
VOLTAGE
RATING (V)
INTERRUPTING
RATING
MELTING
(PRE-ARC)
I
2
T (A
2
s)
TOTAL
CLEARING
I
2
T (A
2
s) AT
RATED VOLTAGE
WATT LOSS
AT 100 %
RATED
CURRENT (W)
AGENCY
CERTIFICATION
FLUSH END
METRIC THREAD
FLUSH END
INCHES THREAD
AC
DC AC DC cURus CCC*
IEC UL AC DC
30
PSR030FL0040
PSR030FS0040
40
690
700
600
200 kA
150 kA
76
280
260
12
•
•
PSR030FL0050
PSR030FS0050
50
690
700
600
200 kA
150 kA
110
598
384
15
•
•
PSR030FL0063
PSR030FS0063
63
690
700
600
200 kA
150 kA
176
1023
640
20
•
•
PSR030FL0080
PSR030FS0080
80
690
700
600
200 kA
150 kA
304
1728
1252
24
•
•
PSR030FL0100
PSR030FS0100
100
690
700
600
200 kA
150 kA
437
2835
1575
27
•
•
PSR030FL0125
PSR030FS0125
125
690
700
600
200 kA
150 kA
707
4684
2783
36
•
•
PSR030FL0160
PSR030FS0160
160
690
700
600
200 kA
150 kA
1359
9114
5507
39
•
•
PSR030FL0200
PSR030FS0200
200
690
700
600
200 kA
150 kA
3012
15169
14700
39
•
•
PSR030FL0250
PSR030FS0250
250
690
700
600
200 kA
150 kA
4668
29952
20833
50
•
•
PSR030FL0315
PSR030FS0315
315
690
700
600
200 kA
150 kA
7131
61830
31600
61
•
•
PSR030FL0350
PSR030FS0350
350
690
700
600
200 kA
150 kA
12007
85320
49273
62
•
•
PSR030FL0400
PSR030FS0400
400
690
700
600
200 kA
150 kA
16209
114750
63367
75
•
•
PSR030FL0450
PSR030FS0450
450
690
700
600
200 kA
150 kA
23133
160110
93533
75
•
•
PSR030FL0500
PSR030FS0500
500
690
700
600
200 kA
150 kA
31429
225180
137333
80
•
•
PSR030FL0550
PSR030FS0550
550
690
700
600
200 kA
150 kA
44323
268920
145400
78
•
•
PSR030FL0630
PSR030FS0630
630
690
700
550
200 kA
150 kA
57404
480010
267800
90
•
31
PSR031FL0200
PSR031FS0200
200
690
700
600
200 kA
150 kA
1965
17334
16188
49
•
•
PSR031FL0250
PSR031FS0250
250
690
700
600
200 kA
150 kA
3789
35343
21080
52
•
•
PSR031FL0315
PSR031FS0315
315
690
700
600
200 kA
150 kA
6862
59130
30694
61
•
•
PSR031FL0350
PSR031FS0350
350
690
700
600
200 kA
150 kA
9523
76140
40996
63
•
•
PSR031FL0400
PSR031FS0400
400
690
700
600
200 kA
150 kA
14770
124335
64359
64
•
•
PSR031FL0450
PSR031FS0450
450
690
700
600
200 kA
150 kA
22457
178200
97444
69
•
•
PSR031FL0500
PSR031FS0500
500
690
700
600
200 kA
150 kA
29751
251505
125935
81
•
•
PSR031FL0550
PSR031FS0550
550
690
700
600
200 kA
150 kA
42056
289170
171845
77
•
•
PSR031FL0630
PSR031FS0630
630
690
700
600
200 kA
150 kA
45403
415500
175500
93
•
•
PSR031FL0700
PSR031FS0700
700
690
700
600
200 kA
150 kA
98187
601425
337260
92
•
•
PSR031FL0800
PSR031FS0800
800
690
700
600
200 kA
150 kA
137208
848880
502800
106
•
•
PSR031FL0900
PSR031FS0900
900
550
600
550
200 kA
150 kA
155163
945100
631820
118
•
32
PSR032FL0400
PSR032FS0400
400
690
700
600
200 kA
150 kA
11104
79650
44533
82
•
•
PSR032FL0450
PSR032FS0450
450
690
700
600
200 kA
150 kA
15535
116100
65463
88
•
•
PSR032FL0500
PSR032FS0500
500
690
700
600
200 kA
150 kA
21573
161460
88277
94
•
•
PSR032FL0550
PSR032FS0550
550
690
700
600
200 kA
150 kA
26327
177660
107960
104
•
•
PSR032FL0630
PSR032FS0630
630
690
700
600
200 kA
150 kA
34790
234900
156963
110
•
•
PSR032FL0700
PSR032FS0700
700
690
700
600
200 kA
150 kA
51191
291870
209287
117
•
•
PSR032FL0800
PSR032FS0800
800
690
700
600
200 kA
150 kA
60125
472770
249000
145
•
•
PSR032FL0900
PSR032FS0900
900
690
700
600
200 kA
150 kA
107785
764100
404000
145
•
•
PSR032FL1000
PSR032FS1000
1000
690
700
600
200 kA
150 kA
190102
933120
672333
146
•
•
PSR032FL1100
PSR032FS1100
1100
690
700
600
200 kA
150 kA
225379
1247400
744000
149
•
•
PSR032FL1250
PSR032FS1250
1250
550
500**
450**
200 kA
150 kA
336661
1114994
1197000
149
•
PSR032FL1400
PSR032FS1400
1400
450
500
450
200 kA
150 kA
551749
1611639
1865400
154
•
PSR032FL1500
PSR032FS1500
1500
450
500
450
200 kA
150 kA
673360
2045907
1735500
171
•
33
PSR033FL0450 PSR033FS0450 450 690 700 600 200 kA 150 kA 13600 106380 58947 99 • •
PSR033FL0500 PSR033FS0500 500 690 700 600 200 kA 150 kA 16434 140400 77846 107 • •
PSR033FL0550 PSR033FS0550 550 690 700 600 200 kA 150 k A 23314 187650 100461 108 • •
PSR033FL0630 PSR033FS0630 630 690 700 600 200 kA 150 kA 38727 285930 142437 113 • •
PSR033FL0700 PSR033FS0700 700 690 700 600 200 kA 150 kA 56763 392580 209863 113 • •
PSR033FL0800 PSR033FS0800 800 690 700 600 200 kA 150 kA 84691 575505 348500 120 • •
PSR033FL0900 PSR033FS0900 900 690 700 600 200 kA 150 kA 122619 740340 451177 122 • •
PSR033FL1000 PSR033FS1000 1000 690 700 600 200 kA 150 kA 222350 1170450 787750 124 • •
PSR033FL1100 PSR033FS1100 1100 690 700 600 200 kA 150 kA 310824 1568700 821400 127 • •
PSR033FL1250 PSR033FS1250 1250 690 700 600 200 kA 150 kA 476902 2403000 1674333 131 • •
PSR033FL1400 PSR033FS1400 1400 690 700 500 200 kA 150 kA 583552 2920050 1979750 144 • •
PSR033FL1500 PSR033FS1500 1500 600 650 500 200 kA 150 kA 674538 2433200 1996733 163 • •
PSR033FL1600 PSR033FS1600 1600 600 650 500 200 kA 150 kA 779948 2942800 2301633 182 • •
PSR033FL1800 PSR033FS1800 1800 600 650 500 200 kA 150 kA 952196 3785040 2724180 224 • •
PSR033FL2000 PSR033FS2000 2000 550 600 500 200 kA 150 kA 1234315 4131600 3755180 222 • •
PSR033FL2250 PSR033FS2250 2250 500 550 450 200 kA 150 kA 1236000 4459651 3859500 299 •
* CCC Certification only on Flush End Metric Thread Version
** PSR032 1250 A: 600 V Ac/550 V Dc