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The 3P-277-480-W is the wired model in EMP Shield's 3-Phase Series for 277/480V AC panels. It is designed for surface-mounted electrical panels and sits on the wall next to the panel it protects. According to EMP Shield, this industrial unit defends against electromagnetic pulses in their E1, E2 and E3 phases, coronal mass ejections (CME), lightning and every form of power surge.
EMP Shield points the series at industrial facilities, agricultural operations, businesses and remote infrastructure. It says the units connect to service panels, motor control centers (MCCs) or transfer switches.
On a surface-mount panel, EMP Shield says the unit may be connected using rigid conduit to any conduit port. The W version comes with preconnected 12 AWG copper wire, which your electrician threads through the conduit into the panel.
Three green diagnostic lights on the cover, labeled PH#1, PH#2 and PH#3, track the three phases. EMP Shield says they light up when power is restored to show the unit is installed and watching the incoming power source. EMP Shield also asks for a location with good visibility of the lights.
The 3-Phase Series carries EMP Shield's rating of 228kA surge capacity per phase and 114kA nominal discharge current per mode. Protection modes are phase-to-phase, phase-to-neutral and phase-to-ground.
EMP Shield says over-voltage shunting starts in less than one nanosecond. The design uses solid-state semiconductor circuitry for each phase, fuses each phase independently and lists IEEE C62.41-1991 category A and B combination wave suppression.
EMP Shield uses a standard J-box style NEMA 4 plastic enclosure with an integrated conduit port, which it says simplifies mounting and gives a convenient connection to an existing branch panel. The units come from a veteran-owned company in Kansas, USA.
EMP Shield describes its 3-phase models as UL 1449 Type 2 compliant. It reports testing at Keystone Compliance to MIL-STD-188-125-1, MIL-STD-461G, MIL-STD-464C and RS-105, with RS-105 levels of 50 kV/m and 90 kV/m, and states its products appear in the Department of Homeland Security's EMP resilience report.
Industrial Facilities. EMP Shield built the 3-Phase Series to protect a facility's critical three-phase electrical infrastructure from EMPs, lightning and high-voltage surges.
Motor Control Centers And Transfer Switches. Beyond service panels, EMP Shield says its three-phase units connect to MCCs and transfer switches.
Agricultural Operations. EMP Shield names agricultural sites among the users it designed the series for.
Remote Infrastructure. Remote infrastructure is on EMP Shield's list too, and the company says the series is meant to help essential operations, equipment and communications get through extreme disruptions.
This wired unit mounts outside a surface-mounted panel with its lights on the cover. EMP Shield's 3P-277-480-RL concealed model is for flush-mounted panels, sitting inside the breaker box with a separate exterior LED box.
Both share the 3-Phase Series ratings, but they are built for different service voltages. Use this model on 277/480V three-phase panels and EMP Shield's 3P-120-208 models on 120/208V panels.
EMP Shield's 120/240V single-phase version is for split-phase residential service. A three-phase 277/480V panel needs a three-phase unit like this one, with protection on all three phases.
EMP Shield says to measure the panel's line-to-neutral voltage to determine the system voltage, and that it must not exceed the maximum continuous RMS voltage on the device label. This unit is for 277/480V three-phase systems.
EMP Shield recommends professional installation, by a licensed electrician working to code. The unit must sit on a line served by a disconnect, such as 20-amp circuit breakers or 20-amp fused disconnect switches. Mount it as close as possible to the panel, keep leads short and connect only copper or copper-clad wire.
Yes. MCCs are one of the three connection points EMP Shield lists, along with service panels and transfer switches.
Three, one per phase. EMP Shield uses one LED for DC versions, two for single-phase power and three for three-phase power.
EMP Shield says to connect the neutral lead as close as possible to the neutral entrance service lug, with each phase lead running through its own selected breaker. Running them straight to the service entrance lugs is not allowed.
The unit carries EMP Shield's 10-year limited warranty against defects in materials and workmanship, with repair or replacement at EMP Shield's option. A lightning-destroyed unit is replaced for $50 after the destroyed unit is sent in. Damaged connected equipment may be reimbursed up to $25,000 under EMP Shield's separate protection policy, provided its conditions are met, which include licensed electrician installation and a claim within 30 days.
The EMP Shield 3-Phase 277-480V EMP Protection unit gives a surface-mounted 277/480V panel EMP, CME, lightning and surge protection, with a status light for each phase on the cover. If you would like help confirming your service voltage before you order, the Outbound Power team is here to help.
EMP Shield 3-Phase 277-480 Volt AC EMP, CME, & Lightning Protection Specifications |
|
|---|---|
| Model | |
| Brand | EMP Shield |
| Model | 3P/277/480V/W |
| SKU | 3P-277-480-W |
| Version | Wired, surface mount |
| Electrical | |
| Voltage | 277/480V AC 3-phase |
| Nominal Discharge Current (In) | 114kA per mode |
| Surge Capacity | 228kA per phase |
| Protection Modes | Phase-to-Phase, Phase-to-Neutral, Phase-to-Ground |
| Response Time | Less than 1 nanosecond (per EMP Shield) |
| Phase Fusing | Each phase independently fused |
| Circuitry | Solid-state semiconductor, each phase |
| Protection | |
| Threats Covered | EMP (E1, E2, E3), CME, lightning, power surges |
| Surge Standard | UL 1449 Type 2 compliant (per EMP Shield) |
| Combination Wave | IEEE C62.41-1991 category A & B |
| Test Lab | Keystone Compliance (per EMP Shield) |
| Test Standards | MIL-STD-188-125-1, MIL-STD-461G, MIL-STD-464C, RS-105 |
| RS-105 Test Levels | 50 kV/m and 90 kV/m (per EMP Shield) |
| Installation | |
| Installation | Professional installation recommended, licensed electrician |
| Connects To | Service panels, MCCs or transfer switches |
| Disconnect | 20-amp circuit breakers or 20-amp fused disconnect |
| Conductor | Copper or copper-clad wire only |
| Panel Type | Surface-mounted panels |
| Mounting | Beside the panel, rigid conduit to any conduit port |
| Leads | Preconnected 12 AWG copper wire |
| Diagnostic LEDs | 3 green (PH#1, PH#2, PH#3) on the unit face |
| Voltage Check | Measure panel voltage line to neutral |
| Neutral Lead | As close as possible to the neutral entrance lug |
| Location | As close as possible to the panel, short leads |
| Panel Cover Clearance | At least 1 inch |
| Conduit Ports | 1 |
| Physical | |
| Enclosure Style | J-box with integrated conduit port |
| Enclosure | NEMA 4 plastic |
| Made In | Kansas, USA |
| Warranty | |
| Limited Warranty | 10 years, defects in materials and workmanship |
| Lightning Replacement | $50 with the destroyed unit sent in |
| Connected Equipment Policy | Up to $25,000, conditions apply |
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