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IDSR Series Indicator® POWR-PRO®
600 V AC/DC • Time-Delay • 1/10 – 600 Amperes
Money is wasted each time a circuit opens and halts production.
The indicator window of the IDSR allows maintenance personnel to
pinpoint blown fuses immediately. The circuit can then be tested and
any problem corrected without unnecessary delay, minimizing costly
downtime.
Applications
DC circuits
All general purpose circuits
Motors
Transformers
Solenoids
Fluorescent lighting
All system components with high in-rush currents
Features/Benefits
The Littelfuse IDSR Indicator fuse offers a patented solid-state design
and provides state-of-the-art reliability along with the convenience of
blown fuse indication. The unique design of the IDSR also features a
600 volt AC/DC rating making it ideal for DC applications.
• Superior Performance – Littelfuse leading edge metallurgy
eliminates all moving parts in a true dual-element design. The IDSR
also provides superior time-delay to withstand minor current surges
without sacrificing protection for sustained overloads or short-
circuit conditions.
• 600 Volt AC/DC Rating – The IDSR is UL Listed for 600 volts
AC/DC, which makes it ideal for a variety of applications. It is also
MSHA approved.
• Reduce Downtime – Costly downtime is minimized using Littelfuse
Indicator fuses. A glance at the indicator window tells if the fuse
has blown. If the window is dark, the fuse has opened. It’s that
simple.
• Increase Safety – Littelfuse Indicator Fuses minimize exposure to
“live” circuit parts while searching for a blown fuse. Other forms of
indication require current to power a light. Littelfuse Indicator fuses
can be identified with the power off.
Specifications
Ampere Ratings
Voltage Ratings:
AC: 600 Volts
1 10
6 10
1 8 10
4
8
30
80
225
DC: 600 Volts
1 8
8 10
2
4 1 2
9
35
90
250
Interrupting Ratings:
AC: 200,000 amperes rms symmetrical
15 100
1
2 1 4
5
10
40
100
300
300,000 amperes rms symmetrical
2 10
1 1 8
2 1 2
5 6 10
12
45
110
350
(Littelfuse self-certified)
1 4
1 1 4
2 8 10
6
15
50
125
400
DC: 20,000 amperes
3 10
1 4 10
3
6 1 4
17 1 2
60
150
450
Ampere Range:
1 10 – 600 amperes
4 10
1 1 2
3 2 10
7
20
70
175
500
Approvals:
Standard 248-12 and UL 198M, Class RK5
1 2
1 6 10
3 1 2
7 1 2
25
75
200
600
UL Listed (File No: E81895)
Example part number (series & amperage): IDSR 30
Note: All fuses rated 1 amp and above are Indicator  ®  fuses.
CSA Certified (File No: LR29862)
MSHA 600 Volt Listing
Dimensions
Recommended Fuse Blocks
Please refer to the FLSR_ID dimensions.
LR600 series
Refer to the Blocks & Holders section of this catalog for additional information.
Contact Littelfuse for characteristic curves.