Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 4.5 A, 600 V AC, 300 V DC - Time-Delay Cylindrical Fuses
LITTELFUSETime-Delay Cylindrical Fuses

LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 4.5 A, 600 V AC, 300 V DC

The LITTELFUSE FLSR Series FLSR04.5 is a Class RK5, time-delay cylindrical fuse rated at 4.5 A, 600 V AC and 300 V DC. This non-indicating fuse is designed for overcurrent protection in industrial electrical systems.

SKU 3G-OTH-26747

Also listed as: FLSR045 · FLSR04 5 · FLSR04-5

Brand
LITTELFUSE
Item
Fuse: Class RK5, FLSR Series, Time-Delay, 4.5 A, 600 V AC, 300 V DC
Category
Time-Delay Cylindrical Fuses
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

LITTELFUSE
Manufacturer Part Number
FLSR04.5
Series
FLSR
Type
FLSR Series, Time-Delay, 4.5 A, Non-Indicating
AC
600 V
DC
300 V

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

LITTELFUSE Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The LITTELFUSE FLSR Series FLSR04.5 is a Class RK5, time-delay cylindrical fuse rated at 4.5 A, 600 V AC and 300 V DC. This non-indicating fuse is designed for overcurrent protection in industrial electrical systems.

Frequently Asked Questions

What is a Littelfuse FLSR04.5 fuse used for?

The Littelfuse FLSR04.5 is a Class RK5 time-delay fuse rated 4.5 A, 600 V AC / 300 V DC. It protects motor circuits, transformers, and control panels from overloads and short circuits. Its non-indicating design suits industrial applications where fuse status is checked by testing rather than visual inspection.

What are the specifications of the Littelfuse FLSR04.5 fuse?

The Littelfuse FLSR04.5 is a Class RK5, time-delay, non-indicating cylindrical fuse. It is rated 4.5 A, 600 V AC, 300 V DC, and belongs to the FLSR series. The manufacturer part number is FLSR04.5. It is designed for branch-circuit protection in industrial equipment.

Where to buy Littelfuse FLSR04.5 fuses worldwide?

3G Electric supplies the Littelfuse FLSR04.5 fuse worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this Class RK5 time-delay fuse.

How to select the right Littelfuse FLSR series fuse for a motor circuit?

To select a Littelfuse FLSR series fuse, match the voltage rating (600 V AC / 300 V DC) and current rating (e.g., 4.5 A) to your circuit. Time-delay fuses handle inrush currents from motors. Verify the interrupting rating meets system fault current. Consult a qualified engineer for proper coordination.

Used in

Common applications for LITTELFUSE
Power electronics protection — Littelfuse PSR Series semiconductor fuses for IGBT and diode protection in variable frequency drives.
Solar photovoltaic systems — Littelfuse SPF Series fast-acting fuses for string overcurrent protection in PV arrays.
Automotive electrical systems — Littelfuse MIDI® 498 Series bolt-on fuses for battery and alternator protection in vehicles.
Industrial control panels — Littelfuse KLKD Series midget fuses for branch circuit protection in control transformers and relays.
Motor control centers — Littelfuse BLF Series fast-acting fuses for short-circuit protection of motor starters and contactors.

LITTELFUSE Products

3G Electric supplies LITTELFUSE time-delay cylindrical fuses. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Compatible alternatives & equivalents

Cross-referenced by specification & description
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 4 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR004)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 4 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR004)
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 40 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR040)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 40 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR040)
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 5.6 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR05.6)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 5.6 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR05.6)
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 5 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR005)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 5 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR005)
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 60 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR060)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 60 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR060)
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 45 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR045)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 45 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR045)

More from LITTELFUSE

View all LITTELFUSE parts →
LITTELFUSE Fuse: Class RK5, FLNR Series, Time-Delay, 40 A, 250 V AC, 125 V DC, Non-Indicating (MPN FLNR040)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLNR Series, Time-Delay, 40 A, 250 V AC, 125 V DC, Non-Indicating (MPN FLNR040)
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 10 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR010)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR Series, Time-Delay, 10 A, 600 V AC, 300 V DC, Non-Indicating (MPN FLSR010)
LITTELFUSE Fuse: Class RK5, FLSR-ID Series, Time-Delay, 8 A, 600 V AC, 300 V DC, Indicating (MPN FLSR008ID)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR-ID Series, Time-Delay, 8 A, 600 V AC, 300 V DC, Indicating (MPN FLSR008ID)
LITTELFUSE Fuse: Class RK5, FLNR Series, Time-Delay, 12 A, 250 V AC, 125 V DC, Non-Indicating (MPN FLNR012)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLNR Series, Time-Delay, 12 A, 250 V AC, 125 V DC, Non-Indicating (MPN FLNR012)
LITTELFUSE Fuse: Class RK5, FLSR-ID Series, Time-Delay, 45 A, 600 V AC, 300 V DC, Indicating (MPN FLSR045ID)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR-ID Series, Time-Delay, 45 A, 600 V AC, 300 V DC, Indicating (MPN FLSR045ID)
LITTELFUSE Fuse: Class RK5, FLSR-ID Series, Time-Delay, 60 A, 600 V AC, 300 V DC, Indicating (MPN FLSR060ID)
LITTELFUSE
LITTELFUSE Fuse: Class RK5, FLSR-ID Series, Time-Delay, 60 A, 600 V AC, 300 V DC, Indicating (MPN FLSR060ID)
LITTELFUSE Fuse: FLQ Series, Midget, Time-Delay, 10 A, 500 V AC, 300 V DC, 13/32 in x 1 1/2 in (MPN FLQ010)
LITTELFUSE
LITTELFUSE Fuse: FLQ Series, Midget, Time-Delay, 10 A, 500 V AC, 300 V DC, 13/32 in x 1 1/2 in (MPN FLQ010)
LITTELFUSE Fuse: FLQ Series, Midget, Time-Delay, 600 mA, 500 V AC, 300 V DC, 13/32 in x 1 1/2 in (MPN FLQ.600)
LITTELFUSE
LITTELFUSE Fuse: FLQ Series, Midget, Time-Delay, 600 mA, 500 V AC, 300 V DC, 13/32 in x 1 1/2 in (MPN FLQ.600)