1-16 BE1-951 General Information 9328900990 Rev L
Input Burden: Burden per contact for sensing depends on the
power supply model and the input voltage.
Table
1-1 provides appropriate burden specifications.
Table 1-1. Burden
Power Supply
Jumper Installed
Burden
Jumper Not
Installed Burden
1 (48/125 V)
13 kΩ 25 kΩ
2 (125/250 V)
25 kΩ 54 kΩ
3 (24 Vdc)
7 kΩ
N/A
Communication Ports
Interface
Front RS-232: 300 to 19200 baud, 8N1 full duplex
Rear RS-232: 300 to 19200 baud, 8N1 full duplex
Rear RS-485: 300 to 19200 baud, 8N1 half duplex
Response Time: <100 msec for metering and control functions
Display
Type: Two line, 16 character alphanumeric LCD (liquid
crystal display) with LED (light emitting diode)
back-light
Operating Temperature: -40°C (-40°F) to +70°C (+158°F)
Display contrast may be impaired at temperatures
below -20°C (-4°F)
Isolation
Meets IEC 255-5 and exceeds IEEE C37.90 one
minute dielectric test as follows:
All Circuits to Ground: 2,828 Vdc
(excludes communication ports)
Communication Ports to Ground: 500 Vdc
Input Circuits to Output Circuits: 2,000 Vac or 2,828 Vdc
Surge Withstand Capability
Oscillatory: Qualified to IEEE C37.90.1-1989 Standard Surge
Withstand Capability (SWC) Tests for Protective
Relays and Relay Systems (excluding
communication ports).
Fast Transient: Qualified to IEEE C37.90.1-1989 Standard Surge
Withstand Capability (SWC) Tests for Protective
Relays and Relay Systems (excluding
communication ports).
(Excluding across open output contacts due to
installed surge suppression components)
Radio Frequency Interference (RFI)
Qualified to IEEE C37.90.2-1995 Standard for
Withstand Capability of Relays Systems to
Radiated Electromagnetic Interference from
Transceivers.
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