Basler Electric BE1-50/51B-241 - Manual (Page 9)

9252000792 Rev D 1
General Information
The BE1-50/51B-241 protective relay is a direct replacement for ABB/Westinghouse type CO and COM
relays housed in an FT-21 case. The BE1-50/51B-241 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 or COM-5 Long Time
CO-6 or COM-6 Definite
CO-7 or COM-7 Moderately Inverse
CO-8 or COM-8 Inverse
CO-9 or COM-9 Very Inverse
CO-11 or COM-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 or COM relay, perform the following steps.
1. Select the desired relay settings on your new BE1-50/51B-241 relay.
2. Remove the existing 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-241 relay is self-powered, compatible with 50 or 60 Hz power systems, and has three
protection elements: one time overcurrent (51) element and two instantaneous overcurrent (50) elements.
The 51 element offers timing characteristic curves similar to those used by GE IAC and Westinghouse
CO/COM 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-241 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
•
Gravity latching targets retain indication without power
•
Built-in accuracy eliminates internal adjustments
•
Minimum transient overreach
BE1-50/51B-241 General Information