Basler BE1-50/51B - User Manual

BE1-50/51B
The BE1-50/51B Time Overcurrent Relay provides economical
overload and fault protection for generators, transformers, lines
and motors.
ADVANTAGES
• Self powered from 50/60Hz systems, available for 5 or 1 amp
CT secondaries.
• Ten field selectable curves.
• Independent instantaneous overcurrent function.
• Drawout construction, testable in the case.
• Qualified to the requirements of:
- IEEE C37.90-1989, C37.90.1-1989, C37.90.2-1989, UL508
• 200 series adds:
- Patented integrating reset characteristic, even when current
goes to zero.
Replicates electromechanical reset for all applications.
- Five additional field selectable curves, for a total of 15.
• Five year warranty.
ADDITIONAL INFORMATION
INSTRUCTION MANUAL
Request Publication 9252000991
TIMING CURVES
Request Publication 9252000998 or 9252000894 for Basler-equivalent IAC curves
Request Publication 9252000999 for Basler-equivalent CO and BS142 curves
STANDARDS, DIMENSIONS and ACCESSORIES
Request Publication SDA
FEATURES and
APPLICATION
Page 2
FUNCTIONAL
DESCRIPTION
Pages 2-5
SPECIFICATIONS
Pages 6 and 7
ORDERING
INFORMATION
Page 8
UHD-14
5-08
P. O. BOX 269 HIGHLAND, ILLINOIS, U.S.A. 62249 PHONE 618-654-2341 FAX 618-654-2351
BE1-50/51B
SELF POWERED
TIME OVERCURRENT
RELAY
Direct replacement "plug and play"
relays are available.
See Product Bulletin UHK.

Basler BE1-50/51B Specifications

General

Brand	Basler
Model	BE1-50/51B
Category	Other
Language	English

Summary

Product Features and Application

Detailed Product Features

Lists selectable curves, time characteristics, instantaneous functions, ranges, accuracy, and construction details.

Product Application Areas

Explains use in phase/ground overcurrent coordination for distribution circuits, transformers, generators, and motors.

Functional Description and Operation

Current Input and Microprocessor Control

Details how AC current powers the relay and how the microprocessor manages operations based on settings.

Output Contacts and Reset Behavior

Describes TIME (51) and INST (50) output contacts, and selectable instantaneous or decaying reset.

Time Element Characteristics

Explains the mathematical relation for time-to-trip and decaying reset curves for various fault conditions.

Technical Specifications

Input, Pickup Ranges, and Accuracy

Details current sensing, time/instantaneous pickup ranges, dropout, and timing accuracy specifications.

Reset, Transient Response, and Characteristics

Covers selectable reset types, transient response, and instantaneous element characteristics.

Environmental and Safety Qualifications

Lists qualifications for isolation, surge withstand, RFI, temperature, shock, and vibration resistance.

Ordering Information and Model Numbers

How to Order

Guidance on designating model numbers and dash numbers to define desired relay configuration.

New Installation Packages

Lists available packages for 5 Amp and 1 Amp CTs, detailing mounting, case, and construction types.