Basler BE-51/27C, Instruction Manual, Page: 10 / 53

BE1-51/27C General Information
1-5
Instantaneous Outputs
One or two instantaneous overcurrent outputs are optionally available. Each is adjustable up to 40 times
the time overcurrent pickup point. When the sensed current exceeds the instantaneous overcurrent pickup
point, an output relay is energized. An independent front panel control (
INST 1 or INST 2 ) adjusts the pickup
point for each optional output. If more than one phase is applied to the relay, the instantaneous pickup point
will be the same for all phases. If neutral current is sensed, a front panel
INST 1 (NEUTRAL)
provides
adjustment of the neutral pickup point. Instantaneous overcurrent elements are not voltage controlled.
Packaging
Each relay is mounted in a drawout cradle and enclosed in a standard utility style case with either semi-flush
or projection mounting (depending upon case style selected). Circuit components are accessed by removing
the individual printed circuit boards from the relay cradle. Use an extender card (Basler Electric part number:
9 1655 00 100) to test and troubleshoot the relay. An available test plug (Basler Electric part number: 10095
or G.E. part number 12XLA12A1) allows the relay to be tested in place without disturbing external control
circuit wiring.
MODEL AND STYLE NUMBER DESCRIPTION
BE1-51/27C Time Overcurrent Relays electrical characteristics and operational features are defined by a
combination of letters and numbers that make up its style number. The model number, together with the
style number, describe the options included in a specific device, and appear on the front panel, drawout
cradle, and inside the case assembly. Upon receipt of a relay, be sure to check the style number against
the requisition and the packing list to ensure that they agree.
Style number identification chart (Figure 1-1) defines the electrical characteristics and operational features
included in BE1-51/27C relays. For example, if the style number were
T3E Z1P B1C1F
, the device would
have the following:
(T)
- 3-Phase-and-neutral sensing, 60 Hz.
(3)
- Sensing input range of 1.5 to 12.0 A for phase, 0.5 to 4.0 A for neutral.
(E) - N.O. outputs.
(Z1)
- Switch selectable B and C time overcurrent characteristic curves.
(P)
- Operating power derived from 125 Vdc or 100/120 Vac.
(B) - Current operated targets.
(1) - One instantaneous element.
(C)
- Push-to-energize outputs.
(1)
- N.O. auxiliary timed output relay.
(F) - Semi-flush mounting.