Basler Electric BE1-50/51B-230 - Manual (Page 11)

9252000894 Rev H BE1-50/51B-230/-234/-239 General Information 1-1
SECTION 1 • GENERAL INFORMATION
Introduction
BE1-50/51B-230, BE1-50/51B-234, and BE1-50/51B-239 relays provide non-directional, single-phase or
ground overcurrent protection and are direct replacements for General Electric IAC66K relays. The BE1-
50/51B-230 and BE1-50/51B-239 have 5 ampere current sensing inputs. The BE1-50/51B-234 has a 1
ampere current sensing input. The BE1-50/51B-230 and BE1-50/51B-234 relays are supplied as draw-out
assemblies that plug directly into existing cases for IAC66K relays. The draw-out assemblies are supplied
with relay covers and adaptor plates for mounting the covers onto existing IAC66K cases. The BE1-
50/51B-239 relay is a draw-out assembly supplied with a case and cover. A connection plug is supplied
with all models.
BE1-50/51B-230, BE1-50/51B-234, and BE1-50/51B-239 relays are self-powered, compatible with 50 or
60 Hz power systems, and have 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 ABB 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.
BE1-50/51B-230, BE1-50/51B-234, and BE1-50/51B-239 overcurrent relays have 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
• Field selectable characteristic curve selection similar to either GE IAC or ABB type curves
• Field selectable instantaneous or integrating reset
• Field selectable 50 or 60 Hz operation
• 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.
Advantages
BE1-50/51B-230, BE1-50/51B-234, and BE1-50/51B-239 overcurrent relays have many advantages over
other overcurrent relays. The primary advantages are:
• Time characteristics are defined by equations and graphs
• Field selectable time characteristics
• Very low burden extends the linear range of the CTs
• Self powered from the sensed current
• Continuous automatic calibration
BE1-50/51B-230, BE1-50/51B-234, and BE1-50/51B-239 overcurrent relays may be tested without
removing the relay from the case. Shorting contacts are provided for all current inputs when the
connection plugs or relay chassis is removed from the relay case.