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Semiconductor Fuses

150/250/500/600/700 VAC Very Fast-Acting 1 – 1000 Amperes

SPECIFICATIONS

Voltage Ratings: L15S:150 V AC/DC (1 – 60A)150 VAC (70 – 1000A)100 VDC (70 – 1000A)L25S:250 V AC/DC (1 – 200A)250 VAC (225 – 800A) 200 VDC (225 – 800A)L50S:500 VAC/450VDC L60S:600 VACKLC:600 VACL70S:700VAC/650VDC Interrupting Rating: AC:200,000 rms amperes (L15S series 100,000 amperes)DC:20,000 amperes Ampere Range: 1 – 1000 amperesSee Rating Table for ratings available in each series. Approvals: UL Recognized under the Components Programand CSA Recognized under the ComponentAcceptance Program.UL File No:E71611 CSA File No:LR29862L15S and L25S series fuses are LittelfuseCertified for DC ratings shown in Rating Table.

AMPERE RATINGS

See Rating Table.

RECOMMENDED FUSE BLOCKS

LSCR series:Refer to Fuse Block section of this catalog foradditional information. Designed to protect today’s equipment and systems,Littelfuse semiconductor fuses are manufactured with Littelfuse-developed technology that sets tomorrow’s stan- dards for accuracy, consistent quality, reliability, and predict- able performance.By using advanced metallurgical, polymer,and materials research;mathematical modeling, and comput-erized statistical analysis;Littelfuse engineers have redefined “State-of-the-Art.”

SAFETY

200,000 A.I.R.— Reliable interruption of all overcurrents up to 200,000 amperes ...meets present and future systemrequirements.(Note:L15S series has 100,000 A.I.R.) Extremely Current Limiting — Low I
2 t and peak let-throughcurrents meet most semiconductor requirements. UL Recognized — Littelfuse semiconductor fuses are recognized under the components program of Underwriters Laboratories, Inc., and carry the mark.UL Recognizedsemiconductor fuses may be used to provide supplemen-tary protection in UL listed equipment.

APPLICATIONS

Designed specifically for supplementary protection of semiconducting devices such as silicon controlled rectifiers (SCR’s), diodes, thyristors, triacs, transistors, and similar solid-state devices.These devices are used in power equipment including variable speed drives, power rectifiers, UPS systems, DC power supplies, and in a wide range ofelectronic equipment.May be used wherever extremely fast-acting, current-limitingfuses with no time delay are required.

LONGER EQUIPMENT LIFE

Low Watt Losses — Means less heating and power consumption in circuit. Controlled Transient Overvoltages — All circuits are subject to transient overvoltages during fault current interruption. These transient overvoltages (arc voltages) start when fuselinks melt or circuit breaker contacts part, and subsidewhen circuit is interrupted.Semiconductors are very sensitive to overvoltages.Littelfuse semiconductor fuse designs keep transient overvoltages to low levels and help reduce semiconductor failure. 80