Basler Electric BE1-50/51B-240 - Manual (Page 9)

9252000790 Rev B 1
General Information
Introduction
The BE1-50/51B-240 protective relay is a direct replacement for ABB/Westinghouse type CO relays
housed in an FT-21 case. The BE1-50/51B-240 has a 5-ampere current sensing input. Compatible
ABB/Westinghouse model numbers are listed in Table 1.
Table 1. ABB/Westinghouse Relays Suitable for Direct Replacement
Catalog Number Curve Type
CO-2 Short Time
CO-5 Long Time
CO-6 Definite
CO-7 Moderately Inverse
CO-8 Inverse
CO-9 Very Inverse
CO-11 Extremely Inverse
Note
If replacing a CO relay manufactured prior to 1966, please contact
Basler Electric to verify compatibility.
To replace an existing ABB/Westinghouse type CO relay, perform the following steps:
1. Select the desired relay settings on your new BE1-50/51B-240 relay.
2. Remove the existing ABB/Westinghouse relay cradle.
3. Insert the new relay cradle.
4. Close the knife-blade switches.
5. Install the new Basler Electric replacement cover glass into existing cover and secure with the
captive thumbnut.
The BE1-50/51B-240 relay is self-powered, compatible with 50 or 60 Hz power systems, and has two
protection elements: one time overcurrent (51) element and one instantaneous overcurrent (50) element.
The 51 element offers timing characteristic curves similar to those used by GE IAC and Westinghouse
CO relays.
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.
In addition, an integrating reset function is available to simulate the disk reset of electromechanical relays.
The BE1-50/51B-240 overcurrent relay has the following standard features.
•
Independent time and instantaneous elements
•
A secure method to manually trip the breaker at the relay front panel
•
Direct reading front panel controls
•
Minimum pickup setting for safety during installation
•
Time characteristics extend to a pickup multiple of 40
•
Rugged draw-out construction with steel case
•
Gravity latching targets retain indication without power
BE1-50/51B-240 General Information