Basler BE1-50/51B-218, Instruction Manual, Page: 11 / 67

9252000995 Rev G BE1-50/51B-218/-228 General Information 1-1
SECTION 1
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GENERAL INFORMATION
INTRODUCTION
BE1-50/51B-218 and BE1-50/51B-228 overcurrent relays are direct replacements for General Electric
IAC relays. BE1-50/51B-218 and BE1-50/51B-228 protective relays are enclosed in an S1 case. The
BE1-50/51B-218 has a 5 ampere current sensing input. The BE1-50/51B-228 has a 1 ampere current
sensing input. Compatible IAC model numbers are listed in Table 1-1.
Table 1-1. GE IAC Relays Suitable For Direct Replacement
IAC Model Number Curve Type
12IAC51A
∗∗∗
A Inverse
12IAC51B
∗∗∗
A
Inverse with Instantaneous
12IAC53A
∗∗∗
A
Very Inverse
12IAC53B
∗∗∗
A Very Inverse with Instantaneous
12IAC55A
∗∗∗
A
Short Time
12IAC55B
∗∗∗
A
Short Time with Instantaneous
12IAC66A
∗∗
A
Long Time
12IAC66B
∗∗
A
Long Time with Instantaneous
12IAC77A
∗∗∗
A Extremely Inverse
12IAC77B
∗∗∗
A
Extremely Inverse with Instantaneous
∗
Any digit covering all pickup ranges and 50 Hz or 60 Hz models.
Basler Electric BE1-50/51B-218 and BE1-50/51B-228 protective relays are self-powered, microprocessor-
based, non-directional phase or ground relays that monitor the magnitude of a single-phase ac current to
provide accurate instantaneous and time overcurrent protection for 50 Hz or 60 Hz power systems. Each
model covers 10 popular time characteristics and a wide range of pickup settings.
FEATURES
A wide range of pickup settings and front panel selectable time characteristics permit applications
involving coordination with fuses, reclosers, cold load pickup, motor starting, and fixed time requirements.
Also, an integrating reset function is available to simulate the disk reset of electromechanical relays.
BE1-50/51B-218 and BE1-50/51B-228 overcurrent relays have the following standard features.
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Independent time and instantaneous elements
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A secure method to manually trip the breaker at the relay front panel
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Direct reading front panel controls
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Minimum pickup setting for safety during installation
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Time characteristics extend to a pickup multiple of 40
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Rugged draw-out construction with steel case
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Gravity latching targets retain indication without power
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Built-in accuracy eliminates internal adjustments
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Minimum transient overreach
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Field selectable characteristic curve selection similar to either GE IAC or ABB type curves
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Field selectable instantaneous or integrating reset
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Field selectable 50 or 60 Hz operation
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Field selectable 0.0 or 0.1 second, fixed, instantaneous delay
Internal switches provide for selecting system operating frequencies of 50 or 60 Hz, instantaneous
element delays of 0.0 or 0.1 second, characteristic curve group selection for either GE IAC or ABB type
curves, and instantaneous or integrating reset characteristics. Switch location and description is provided
in Section 2.