Proven High-Energy Fault Protection
Overwatch HEFPD
Product Description
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.
AREMA Class 2000: AC Fault Current
2000A at 12 cycles
1265A at 30 cycles
894A at 60 cycles
632A at 120 cycles
AC Fault Current Ratings – Amps-rms @ 60Hz
AREMA Class 4000: AC Fault Current
4000A at 12 cycles
2530A at 30 cycles
1789A at 60 cycles
1265 at 120 cycles
AC Fault Current Ratings – Amps-rms @ 60Hz
Lightning Surge Protection
• Peak let-through: <1,000V
40kA, 8x20 microsecond waveform
• Peak let-through: <1,500V
Fully functional after 15 repetitive tests at 40kA, 8x20
Untriggered Electrical Characteristics
100 Ohm min. DC to 1kHz
3mA max, 3rd & 5th Harmonic, 20Hz to 500Hz
For full specifications, please refer to the Technical Literature.
Trigger Voltage
Enclosure
Powder Coated, Stainless Steel
Lockable
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