Basler Electric BE3-37 User Manual
www.basler.com
+1 618.654.2341 (USA)
info@basler.com
INTRODUCTION
BE3 ac current relays provide current monitori ng and protection in
both single-phase and three-phase systems. They are used in
applications such as motor protection, load det ect i on, and generator
control. Undercurrent, overcurrent, and c ombined ov er/underc urrent
units are available. BE3 ac current relays operate when the
adjustable trip point is reached. A time delay c ontrol i s provided with
an adjustment of 0 to 10 seconds (relay operating time is typically
200 milliseconds). This time delay may be used to prevent false
tripping when there are slight variations in the sensed current . On
overcurrent units, the output relay energizes when the input signal
exceeds the trip point. On undercurrent units, the output relay deenergizes when the input signal goes below the trip point. A red
LED indicates the state of the output relay. A green LED indicates
the condition of the power supply.
SPECIFICATIONS
Inputs
Operating Power
All units require external operating power.
Nominal Voltage: 120 Vac, 240 Vac, 380 Vac, 480 Vac,
or 24 Vdc
Current Sensing
Nominal: 5 Aac
Range: 0.2 to 10 Aac
Overload Withstand: 50 Aac for 3 s
Frequency: 50, 60, or 400 Hz
Burden: <0.5 VA per phase
Setpoint
Undercurrent Range: Adjustable 0 to 80% (±3%) of
nominal
Overcurrent Range: Adjustable 40 to 120% (±3%) of
nominal
Repeatability: Better than 0.5% of full span
Time Delay: Adjustable 1 to 10 sec
Operating Time: 200 ms typical
Differential: Fixed at 5% of nominal
Outputs
Relay Type: D.P.D.T.
AC Rating: 250 V, 5 A, non-resistive,
1200 VA
DC Rating: 125 V, 1 A, resistive, 120 W
Mechanical Life: 5 million operations
Temperature
Operating Temperature: 0°C (32°F) to 60°C (140°F)
Functional Temperature: –25°C (–13°F) to 70°C (158°F)
Storage Temperature: –40°C (–40°F) to 70°C (158°F)
Temperature Coefficient: 0.03% per °C (300 ppm/°C)
Humidity
Relative Humidity: 95% non-condensing
Physical
Mounting: DIN rail 1.38” by 0.29” (35 mm by 7.5
mm)
Model
Case: Complies with IEC 529, DIN 40050,
Case Material: Complies with UL 94VO
BE3-37, BE3-51, and BE3-37/51
BS 5490
Weight
Single Unit: 0.88 lb (0.4 kg)
Combined Unit: 1.32 lb (0.6 kg)
Size
Single Unit: 2.17” wide (55 mm)
Combined Unit: 3.93” wide (100 mm)
Agency
cULus Listed to UL 508 and CSA C22.2 No. 14
CE compliant
GOST-R certified per the relevant standards of Gosstandart of
Russia
OPERATION
BE3-37 and BE3-51 ac current relays have two external, useradjustable controls marked SET and DELAY . The BE3-37/51 has
four controls: UNDER SET, UNDER DELAY, OVER SET, and
OVER DELAY. The SET control adjusts the relay trip point. An
overcurrent trip causes the relay output to energize when the
current rises above the SET threshold. The overcurrent SET level is
adjustable from 40 to 120% (±3%) of nominal input. An undercurrent
trip causes the relay output to de-energize when the current
decreases below the SET threshold. The undercurrent SET level is
adjustable from 0 to 80% (±3%) of nominal input. Time delay is the
amount of time that elapses after the trip point is reached and when
the output relay operates.
Setting Example
A BE3-51 relay has the following settings:
SET - 120%
DELAY - 4 seconds
A trip occurs when the sensing c urrent rises above six am peres for
four seconds. Reset occurs when the current decreases below 5.75
amperes (5% of nominal below trip setting).
INSTALLATION
BE3 ac current sensing relays are designed for mounting on
standard DIN rails that c omply t o DIN-EN 50022. Mounting involves
hooking the top edge of the cutout on the base of the case over one
edge of the DIN rail. The opposite side of the cutout contai ning the
release clip is then pushed over t he opposite side of the DIN rail. To
remove or reposition the relay, lever the release clip and move the
relay as required. BE3 relays should be installed in a dry, vibrationfree location where the ambient temperature does not exceed the
operating temperature range. Connections to the relay should be
made using wire that meets applicable codes and is properly sized
for the application. Figure 1 shows the t erminal connections for the
BE3-37, BE3-51, and BE3-37/51 ac current relays.
CALIBRATION
The calibration marks on the faceplate have a maximum error of
10% and are provided only as guides. Proper cali bration requires
using an accurate ammeter in series wit h the current source. Use
the following procedure to calibrate your relay.
Overcurrent
1. Adjust the SET control fully clockwise (CW) and the DELAY
control fully counterclockwise (CCW).
2. Apply the desired trip current to the relay.
Publication
9319900990
Revision
D
Instructions
Date
03/14
Copyright
2014
3. Slowly adjust the SET control CCW until the relay trips. (allow
for the 200 ms operating time).
4. Remove the applied current (do not change the current level)
and set the DELAY control to the desired time delay.
5. Apply the trip current to the relay and measure the time to trip.
6. Adjust the DELAY and repeat Steps 4 and 5 until the desired
time delay is achieved.
Undercurrent
1. Adjust the SET and DELAY controls fully CCW.
2. Decrease the applied sensing current f rom the nominal value
until the desired tripping current is reached.
3. Slowly adjust the SET control CW until the relay trips (allow for
the 200 ms operating time).
FIGURES
4. Set the DELAY control to the desired time delay and apply
nominal current to the relay.
5. Step down the applied current from nominal to a level just
below the trip level set in Step 3.
6. Adjust the DELAY and repeat Steps 4 and 5 until the desired
time delay is achieved.
MAINTENANCE
BE3 relays are solid-state devices that require no maintenance. In
the event that your relay requires repair, contact Basler Electric,
Highland, IL, USA for return authorization.
ORDERING INFORMATION
Figure 2 shows the BE3 ac current relay style numbers.
Publication
9319900990
Figure 1. BE3-37, BE3-51, BE3-37/51 AC Current Connections
Figure 2. BE3-37, BE3-51, BE3-37/51 Style Number Identification Chart
Revision
D
Instructions
Date
03/14
Page
2 of 2
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