Ditek D100-277/4803Y 100kA/Phase, 50kA Mode Surge Protector, 277/480VAC Three Phase Wye

The DITEK D100-277/4803Y is a Type 1 industrial surge protective device (SPD) with 100,000 amps of surge current capacity per phase and 50,000 amps per protection mode for 277/480 VAC three-phase Wye electrical systems. Designed for commercial and industrial distribution panels rated from 200 to 600 amps, it features individually fused surge protection components, diagnostic LED status indication, and a NEMA 4X weather-resistant polycarbonate enclosure. The unit provides a 100kA short-circuit current rating, 20kA nominal discharge current rating, and UL 1449 5th Edition certification.

DITEK D100-277/4803Y 100kA Three-Phase Wye Surge Protective Device

The DITEK D100-277/4803Y is a high-capacity industrial surge protective device designed to protect 277/480 VAC three-phase Wye electrical distribution systems against transient overvoltages caused by lightning-induced surges, utility switching, and other electrical disturbances. Part of DITEK's D100 Series, this surge protector provides 100,000 amps of surge current capacity per phase and 50,000 amps per protection mode for commercial and industrial electrical applications. The device is engineered for three-phase, four-wire plus ground (4W+G) electrical services operating at 277 volts line-to-neutral and 480 volts line-to-line. DITEK recommends the D100 Series for electrical panels rated from 200 to 600 amps, including branch panels, distribution panels, switchboards, and other compatible electrical distribution equipment. Its parallel-connected design allows the device to suppress transient voltage spikes without carrying the electrical system's normal load current, helping protect downstream equipment such as building automation controllers, industrial electronics, security systems, and other sensitive electrical loads.

The D100-277/4803Y incorporates individually fused surge protection components and a 100,000-amp short-circuit current rating (SCCR) to support installation on appropriately rated electrical distribution systems. Its maximum continuous operating voltage (MCOV) ratings are 320 VAC line-to-neutral and 640 VAC line-to-line, matching the requirements of the specified three-phase Wye configuration. Under UL 1449 testing, the device has a 20kA nominal discharge current rating (In) and manufacturer-published voltage protection ratings (VPR) of 1,000 volts line-to-neutral, 1,200 volts line-to-ground, 1,800 volts line-to-line, and 1,800 volts neutral-to-ground. These ratings describe the device's performance across multiple electrical protection paths under standardized surge testing conditions. The D100 Series also features a diagnostic LED indicator that provides visual confirmation of system power and surge protection status, allowing maintenance personnel to identify when the protection assembly requires inspection or replacement. The integrated surge protection circuitry is designed for repeated transient events within its specified operating limits, helping reduce exposure of connected electrical equipment to damaging voltage spikes.

The DITEK D100-277/4803Y features a NEMA Type 4X polycarbonate enclosure measuring 4.72 inches long, 4.72 inches wide, and 2.36 inches high (120 x 120 x 60 mm), providing environmental protection for qualifying indoor and outdoor installations. The assembly weighs approximately 2 pounds (0.9 kg) and operates in temperatures from -31 F to +140 F (-35 C to +60 C), with a maximum relative humidity of 95% noncondensing. Electrical connections are made through a 1/2-inch NPT liquid-tight conduit fitting with factory-supplied 30-inch, 10 AWG conductor leads. Installation requires connecting the three black phase conductors to the load side of a three-pole circuit breaker, the white conductor to the neutral bus, and the green conductor to the equipment grounding bus. DITEK recommends a 30-amp circuit breaker and specifies that the surge protector should be mounted as close as practical to the electrical panel to minimize conductor length. Short, direct electrical connections help reduce additional voltage developed across the wiring during surge events, improving protection performance at the connected equipment. The compact enclosure includes mounting feet for secure attachment, and the optional DITEK DTK-FMKHD2 flush-mount kit supports installations requiring a recessed or finished mounting configuration.

The DITEK D100-277/4803Y is designed for commercial buildings, manufacturing facilities, warehouses, institutional properties, data centers, and industrial electrical distribution systems operating on 277/480 VAC three-phase Wye power. Its combination of high surge current capacity, individually fused protection components, diagnostic LED indication, and weather-resistant construction supports protection of electrical infrastructure exposed to transient voltage disturbances. The device is UL 1449 5th Edition Listed as a Type 1 surge protective device and carries applicable CSA C22.2 No. 269.1-17 certification. Its 100kA SCCR and 20kA nominal discharge current rating provide defined performance characteristics for electrical system coordination and SPD selection. Unlike the DITEK D100-4803D, which is designed for 480 VAC three-phase Delta systems without a neutral connection, the D100-277/4803Y is specifically configured for a grounded Wye system with separate neutral and ground conductors. The higher-capacity DITEK D200-277/4803Y provides 200kA surge current capacity per phase for applications requiring additional surge handling capability. The standard D100-277/4803Y contains no user-serviceable surge protection components and must be replaced if its internal protection reaches the end of its service life. Backed by DITEK's 10-year limited manufacturer warranty, the D100-277/4803Y provides a compact industrial surge protection solution for compatible three-phase electrical panels and commercial power distribution equipment.