Dairyland
Overwatch HEFPD
SKU: OVERWATCHHEFPD
Proven High-Energy Fault Protection
When railroad systems share common corridors with overhead power transmission or distribution systems, they are susceptible to damaging power line fault and lightning surge events. Dairyland’s Overwatch HEFPD was designed using our decades of experience in high-energy applications to withstand the powerful, long-duration events caused by AC faults. Developed in response to the new AREMA C&S Manual Part 11.3.7 for High-Energy Fault Protective Devices, Overwatch will protect your track-connected signal and crossing warning systems and prevent costly interruptions.
Key Benefits
- Proven Solid-State Components: Eliminate arc or spark concerns.
- High-Energy AC Fault and Lightning Surge Protection: Provides both high-energy AC fault and primary lightning surge protection.
- Multiple Event Protection: Withstands multiple AC fault or lightning surge events within ratings without failure.
- Automatic Reset: Automatically resets following an AC fault or lightning surge event in the presence of up to 3 V DC steady state.
- Configurable Connections: Connections can be configured to optimize ratings and performance for multiple applications.
Specifications
- AC Fault Current Ratings (Amps RMS at 60 Hz): Class 2000: 2,000 A for 6 cycles (0.1 sec.) and 12 cycles (0.2 sec.); 1,265 A for 30 cycles (0.5 sec.); 894 A for 60 cycles (1.0 sec.); 632 A for 120 cycles (2.0 sec.). Class 4000: 4,000 A for 6 cycles (0.1 sec.) and 12 cycles (0.2 sec.); 2,530 A for 30 cycles (0.5 sec.); 1,789 A for 60 cycles (1.0 sec.); 1,265 A for 120 cycles (2.0 sec.).
- Lightning Surge Protection Rating: 20 kA, 8 × 20 microsecond waveform, peak let-through less than 1,000 V; 40 kA, 8 × 20 microsecond waveform, peak let-through less than 1,500 V.
- Repetitive Lightning Surge Testing: Fully functional after 15 repetitive tests at 40 kA, 8 × 20 microseconds.
- Maximum Continuous Operating Voltage (MCOV): 50 V AC RMS ±3 V DC.
- Untriggered DC Resistance: 100 ohms minimum, DC to 1 kHz.
- Harmonic Current: 3 mA maximum, 3rd and 5th harmonic, 20 Hz to 500 Hz.
- Trigger Voltage (VBP): 100 V RMS ±10% (142 V peak) at 22°C.
- Operating Temperature: -40°C to +70°C (-40°F to +158°F).
- Storage Temperature: -40°C to +85°C (-40°F to +185°F).
- Relative Humidity: 5–95%, non-condensing.
- Vibration: 0.1-inch peak-to-peak at 5–20 Hz; 2.0 G peak at 20–200 Hz.
- Dielectric Strength: 3,000 V RMS.
- Mechanical Shock: 10 G.
- Enclosure: NEMA 4X stainless steel, powder-coated and lockable.
- Dimensions: 16 inches W × 20 inches H × 8 inches D, with 2-inch mounting flanges at the top and bottom.
- Weight: 75 lb.
- Configuration: Available in single-channel and dual-channel models. Class 2000 or Class 4000 configuration is determined by the installed connection configuration.
- Fuse Module: Serviceable fuse module available as a replacement. The fuse module protects the Overwatch circuitry and/or bungalow signaling equipment if an AC fault or lightning surge exceeds product ratings.
- Standards: Meets AREMA Manual Part 11.3.7 specifications; environmental specifications per AREMA 11.5.1, Class B: Wayside Outdoors.
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Shipping & Returns
Shipping costs and delivery timelines vary by order. All returns require prior written approval and may be subject to a restocking fee.
Please review our Terms & Conditions for complete shipping, return, and warranty details.
