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The SWARTZ® Type 76 Overcurrent Relay from SMC
is them most widely accepted protective overcurrent device used in the transit industry
today, having been successfully used in every major transit system. The overcurrent relay
provides maximum protection for trolley wires, third rails, feeder and supstations from
intermediate or remote overload conditions such as bolted faults, arcing faults, and
severe overloads. The solid state design and rugged construction ensure dependable low
maintenance operation under adverse conditions.
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 | Uni-Bi directional: mode indicating, field switchable |
| LED Meter - Accurate, easy to read |
| Draw out construction |
| Detector channels include: instant overcurrent: range 10 to 300 mv, short-time
overcurrent: range 10 to 110 mv, long-time overcurrent, rate of rise |
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| Internal Power Supply operates on and auto-compensates for a wide range of DC inputs |
| Calibration controls: allows preset treshold and time delays on all protective channels |
| Use with any shunt |
| For use with positive & negative conductors in DC Networks |
| Field Calibration |
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The Type 76 DC Overcurrent Relay is an isolated current monitor and
overcurrent relay that may be used for either the positive or negative conductors in DC
power distribution networks. The device is designed as a stand-alone relay or may be used
in conjunction with a Type 82 automatic recloser relay. In combination with a recloser
relay, it will automatically interrupt a fault and then reclose to continue service. SMC's
unique rate of rise channel detects arcing faults on systems too far removed to be
detected by the instantaneous overcurrent channel. The Type 76 DC Overcurrent Relay front
panel controls are calibrated in millivolts so that the relay is compatible with any type
of shunt. The built-in calibration components allow accurate field calibration of each
channel and feeder current settings.
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| Input Power: Operates on 24 - 125 VDC or
120 VAC |
| Supply Current:40 mA at 125 VDC 200 mA at
24 VDC |
| Ambient Temperature:-20°C to +55°C |
| Design Test:SWC ANSI/IEEE C37.90 |
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| Isolation Dielectric: 5400 V, 60 Hz, 1
min. |
| Threshold Setting Error:+ .5 mV |
| Isolation Error:+ 1 mV |
| SCR Output:100 mA to 6 A (1 sec.) 200 V |
| Annunciation:Reed Relay 100 VA, 2A, 500
VDC |
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| Interface Diagram
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Relay Case Dimensions
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Click to Enlarge
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Click to Enlarge
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For SMC Components Operation
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