SC-30 TIME DELAY FUSE BUSSMANN

SC-30 TIME DELAY FUSE BUSSMANN – Industrial 30A 480VAC/170VDC Class G Time-Delay Fuse

The SC-30 TIME DELAY FUSE BUSSMANN (Model SC-30) is an industrial-grade, Class G time-delay current-limiting power fuse manufactured by Eaton’s Bussmann series. Engineered specifically to deliver overcurrent, short-circuit, and motor-surge protection for branch circuits, lighting systems, and small inductive loads, this $30text{-amp}$ , $480text{ VAC} / 170text{ VDC}$ fuse combines current-limiting protection with a compact physical footprint for commercial and industrial panelboards.

Featuring dual-element time-delay characteristics, the SC-30 TIME DELAY FUSE BUSSMANN holds a minimum 12-second time-delay at $200%$ of its rated current. This delayed operational profile allows temporary motor starting currents, transformer magnetizing inrushes, and inductive coil transients to pass without causing nuisance fuse openings. Under severe electrical fault conditions, its fast current-limiting action safely interrupts prospective short-circuit currents up to $100text{ kA RMS}$ Symmetrical at $480text{ VAC}$ and $10text{ kA}$ at $170text{ VDC}$ . Constructed in a size-rejecting Class G ferrule body format ( $13/32'' times 1-5/8''$ ), its length-proportional sizing prevents over-fusing errors during maintenance.

As shown in the image, the fuse features a durable cylindrical tube body wrapped with a green product label reading “BUSS® Class G Fuse Type Ampere SC-30 Time-Delay”, fitted on both ends with conductive nickel-plated ferrule end contact caps.

Key Features of the SC-30 TIME DELAY FUSE BUSSMANN

Dual-Element Time-Delay Design: Holds a minimum $12text{-second}$ time-delay at $200%$ rated load, eliminating nuisance tripping caused by motor startup surges and inductive transients.
Class G Size Rejection Feature: Built with unique physical length characteristics per amperage range ( $13/32'' times 1-5/8''$ for $26text{A}text{--}30text{A}$ ), preventing higher-rated fuses from being improperly substituted.
High $100text{ kA}$ Interrupting Capacity: Rated to safely interrupt short-circuit currents up to $100text{ kA RMS}$ Symmetrical at $480text{ VAC}$ ( $10text{ kA}$ at $170text{ VDC}$ ), ensuring NEC® compliance in high fault-current panels.
Fast Current-Limiting Action: Limits peak let-through thermal energy ( $I^2t$ ) and magnetic forces during short circuits, protecting downstream equipment and conductors from damage.
High Voltage Handling in Compact Size: Rated for continuous operation up to $480text{ VAC}$ and $170text{ VDC}$ , providing high-voltage performance in a compact footprint.
Durable Construction: Built with a high-strength composite casing and nickel-plated ferrule caps to ensure reliable contact and thermal stability.

Common Applications and Practical Usage

The time-delay performance, $30text{A}$ rating, and size-rejection footprint of the SC-30 TIME DELAY FUSE BUSSMANN make it a protective component across commercial and industrial installations:

Commercial & Industrial Lighting: Protects branch circuits supplying high-density fluorescent, HID, and LED panel lighting feeders.
Small Fractional-Horsepower Motors: Safeguards HVAC blowers, pump motors, and small industrial drives against sustained overloads and short circuits.
Control Transformer Primary Protection: Protects transformer primaries against fault currents while riding through heavy magnetizing inrush surges.
General Branch Circuit Distribution: Serves as primary protection in space-constrained 480V panelboards, switchboards, and fused disconnect switches.

Technical Specifications

The core electrical, physical, and compliance parameters for the SC-30 TIME DELAY FUSE BUSSMANN are detailed below:

Parameter Specification	Technical Details & Operational Values
Component Classification	Industrial Class G Time-Delay Current-Limiting Fuse
Primary Target Keyword	SC-30 TIME DELAY FUSE BUSSMANN
Brand / Series	Eaton Bussmann Series / SC Class G
Catalog Model / Part No.	SC-30
Amperage Rating	$30text{ Amps}$ ( $30text{A}$ )
Voltage Rating	$480text{ VAC}$ / $170text{ VDC}$
Interrupt Rating (IR)	$100text{ kA RMS}$ Symmetrical at $480text{ VAC}$ / $10text{ kA}$ at $170text{ VDC}$
Response Characteristic	Time-Delay (Min. $12text{ seconds}$ at $200%$ current)
Fuse Class & Form Factor	UL Class G Ferrule ( $13/32'' times 1-5/8''$ $10.3text{ mm} times 41.3text{ mm}$ )
Terminal Connection Type	Ferrule End Caps
Body Material	Composite Tube Casing with Nickel-Plated End Caps
Agency Certifications	UL Listed (Std 248-5, Class G, Guide JDDZ), CSA Certified, CE, RoHS Compliant

Operating Guidelines and Usage Tips

SAFETY NOTICE: Always isolate main power supplies and verify circuits are completely de-energized using a calibrated voltage tester prior to inspecting or replacing power fuses.

Holder Compatibility: Mount in standard UL Class G fuse blocks or finger-safe modular DIN-rail holders (such as Bussmann BG series fuse blocks).

Motor Circuit Sizing: When protecting motor branch circuits, select ampacity according to NEC® Article 430 rules to ensure proper overload protection without nuisance trips during motor acceleration.

To review official low-voltage fuse standards and Class G protection requirements, consult the National Electrical Manufacturers Association (NEMA) Directory.

To check regional warehouse inventory availability or request commercial quotes for volume electrical fuses, visit the Control Qatar Contact Page.

SC-30 TIME DELAY FUSE BUSSMANN