The Model SSS-HBD2 provides Line-to-Ground Lightning Protection on higher voltage power and signal line pairs with a Line-to-Line maximum voltage of 360VDC
or 254VRMS (AC) [i.e. Line-to-Ground protection of High Voltage DC Switch Machine Power is one of many applications].
Components are mounted to a printed circuit board that is form and fit compatible with a standard lightning adapter
Dual High-Energy 20mm MOVs with High-Energy Gas Tube Arrester Protection
High-Energy Gas Tube provides air gap isolation
High-Energy MOVs eliminate any continuous follow through arcing of the Gas Arrester
All components are UL Listed
Robust and cost effective Line-to-Ground Protection solution for low voltage signal, power, and communication where lines must be isolated
from ground or where continuous arcing of the arrester is a concern
Very cost-effective
Features:
Mounts on standard AAR terminal blocks (not supplied) with 2-3/8" center-to-center post dimensions (standard for lightning arresters)
or any AAR terminal block strips that are positioned to accept a standard lightning arrester spacing
Incredibly High Residual Arc Voltage, 182 Volts minimum
Utilizes open slots at the ends of the circuit board for mounting flexibility and easy maintenance
All copper traces are on the underside of the board to prevent accidental shorting
Connection to the AAR Posts is on the underside of the circuit board
Used as Line-to-Ground protection on Line Pairs whose Line-to-Line Voltage does not exceed 360VDC or 254VRMS
Not for track-wire Line-to-Ground protection
Electrical & Temperature Specifications
Used as Line-to-Ground protection on Line Pairs whose Line-to-Line Voltage does not exceed 360VDC or 254VRMS
Maximum continuous applied DC voltage (across the device) = 180VDC
Maximum continuous applied AC voltage (across the device) = 127VRMS
DC Conduction Voltage @ 1mA (steady energy applied) = 298 to 400VDC
Peak Current Handling Capability = >15kA (8x20μS Waveform)
Energy Handling Capability = >150 Joules
Typical Capacitance = 1pF
Operating Temperature Range: -40 to +70°C
Typical firing voltage for a 1000V/μS transient ≈ 1100 Volts Peak
Residual Arc Voltage (across the device) = 182 Volts minimum
Insulation Resistance = >1000 MΩ
Surge Life = 1000 minimum @ 500A (10x1000μS)
Dimensions:
Schematic:
Summary:
The Model SSS-HBD2 is mechanically the same as the Model SSS-HBD1. Electrically it has a higher conduction voltage for applications requiring Line-to-Ground
protection on higher voltage DC circuits and control lines. The hybrid components are mounted on a printed circuit board that is form and fit compatible with a standard lightning arrester
mounting (2-3/8" terminal spacing). This assembly uses a high current Gas Discharge Tube (GDT) wired in series with a parallel pair of high energy Metal Oxide Varistors. The GDT
provides a true isolation barrier between the protected circuit lines and earth ground. The Varistors are in the circuit to extinguish any follow-through arcing that may occur when
they are used to protect DC power, control lines, correspondence lines, signal lines, and any lines carrying DC power inside or outside the Signal House or Case.
When applying these arresters, be sure the Line-to-Line (differential) voltage of the wiring being protected does not exceed 360VDC or 254VRMS. One application would be
for the protection of the DC power to high voltage Switch Machines operating between 110VDC and 130VDC. Another application is where high Line-to-Ground induction voltages are encountered.
Note: These are not to be used as Line-to-Ground protection for wires connected directly to the rails.
