Basler Electric BE1-51/27C - Manual (Page 10)

4 9137200998 Rev E
•
24 Vdc
•
48 Vdc
•
125 Vdc and 100/125 Vac
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48 Vdc or 125 Vdc and 100/125 Vac
•
250 Vdc and 240 Vac
Targets
Single-phase relays have two function targets that indicate when the time delay or instantaneous
element(s) have operated. On multiple phase relays, additional targets indicate which phase or neutral
element(s) operated.
Function targets may be specified as either internally operated or current operated by a minimum of 0.2
amperes through the output trip circuit. When current operated, the output circuit must be limited to 30
amperes for 0.2 seconds, 7 amperes for 2 minutes, and 3 amperes continuously.
Outputs
Optional normally opened, normally closed, or SPDT auxiliary output contacts may be selected. Contacts
actuate when the output relay is energized. Internally operated front panel mounted targets, and front
panel targets operated by the dc current in the output circuit are available for the time overcurrent and
instantaneous overcurrent functions. Optional front panel mounted PUSH-TO-ENERGIZE-OUTPUT
pushbuttons allow direct actuation of each output relay for external circuit testing.
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). An available test plug (Basler Electric
part number 10095) allows the relay to be tested in place without disturbing external control circuit wiring.
Model and Style Number Description
Electrical characteristics and operational features included in a particular style of the BE1-51/27C Time
Overcurrent Relay are defined by a combination of letters and numbers that make up its style number.
The model number, together with the style number, describes the options included in a specific device,
and appears 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.
The Style Number Identification Chart (Figure 1) illustrates the manner in which the relay style number is
determined. For example, if the style number were T3E-Z1P-B1C1F, the device would have the following
characteristics:
T - Three-Phase-and-Neutral sensing, 3-phase, 4-wire voltage control
3 - Sensing input range of 1.5 to 12.0 amperes for phase and 0.5 to 4.0 amperes for neutral
E - Normally open outputs
Z1 - Switch selectable time curves
P - Operating power derived from 125 Vdc or 120 Vac
B - Current operated targets
Introduction BE1-51/27C