Square D Digest 179

Fusible and Non-Fusible Overview

Double Throw Safety Switches

Class 3140

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30–100 A Types DT, DTU (Series F)

• Fusible (DT) and non-fusible (DTU) switches available • Manually-operated switch suitable for use in accordance with article 702 of the NEC, ANSI/NFPA 70 • Standards: UL 98, Type KS1, CSA, and NOM • Modular design—switch handle, lock-plate, switch mechanism; line and load bases are field replaceable • UL Listed short circuit current ratings up to 200 kA (using with (fusible) or (non-fusible) Class R, J, or T fuses—see table for rating) • Load make/break rated • May be padlocked ON (I) or OFF (O) • Lock-off accepts up to three padlocks • Side-opening door • Quick make / quick break mechanism • Meets NEMA requirements as heavy duty switch • Field-installed electrical interlock kits • Field-installed neutral assembly kits (2P and 3P switches) • UL Listed as suitable for use as service equipment • Supplied as standard for switching one load between two power sources, and may be field-converted to switch one power source between two loads. 30 (Series T4), 200–600 A Types 82,000 & 200 A DTU (Series E, A) • Non-fusible • Designed for manual transfer of one load between two power sources • UL Listed switches are suitable for use in accordance with Article 702 of the National Electrical Code, ANSI / NFPA 70 • 82,000 and DTU double throw switches are continuous duty rated for their nameplate ampere rating • The 82,000 and DTU (Series E, A) switches are load make/break rated • UL Listed as suitable for use as service equipment • Horsepower rated only as footnoted Field-Installable Accessories • Neutral • Electrical Interlock • Grounding Terminals • Horsepower rated • Dual cover interlock

30–100 A DT, DTU (Series F) NEMAType1

3 SAFETY SWITCHES

82,000 Line NEMAType1

3-25

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