9252000897 Rev A
BE1-50/51B-233 General Information
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SECTION 1
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GENERAL INFORMATION
INTRODUCTION
BE1-50/51B-233 protective relays are direct replacements for Westinghouse/ABB type CO relays. The
BE1-50/51B-233 has a 5 ampere current sensing input. Specific relays by catalog number are listed in
Table 1-1.
Table 1-1. ABB Relays Suitable for Direct Replacement
ABB Catalog Number
Curve Type
CO-2
∗
11
∗
1N
Short Time
CO-5
∗
11
∗
1N
Long Time
CO-6
∗
11
∗
1N
Definite
CO-7
∗
11
∗
1N
Moderately Inverse
CO-8
∗
11
∗
1N
Inverse
CO-9
∗
11
∗
1N
Very Inverse
CO-11
∗
11
∗
1N
Extremely Inverse
∗
Any digit covering all pickup ranges except 50 Hz models.
To replace an existing Westinghouse/ABB type CO (hereinafter referred to as ABB relay), perform the
following steps.
1. Select the desired relay settings on your new BE1-50/51B-233 relay.
2. Remove the existing ABB relay cradle.
3. Insert the new relay cradle.
4. Close the knife-blade switches.
5. Install the new Basler Electric cover and secure with the captive thumbnut.
Basler Electric BE1-50/51B-233 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 60 Hz power systems. Each model covers 15
popular time characteristics, a wide range of pickup settings, and field selectable instantaneous or
integrating reset.
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-233 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 0.0, 0.1, 0.2, or 0.3 second, fixed, instantaneous delay
Internal switches provide for selecting instantaneous element delays of 0.0, 0.1, 0.2, or 0.3 second,
characteristic curve group selection for either ABB CO or GE IAC type curves, and instantaneous or
integrating reset characteristics. Switch location and description is provided in Section 2.
Summary of Contents for BE1-50/51B-233
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