lit
1-
ABB Power T&D Company Inc.
Relay Division
Coral Springs, FL
Allentown, PA
August, 1991
Supersedes Descriptive Bulletin 41-123M,
page 3, dated January 1, 1991
Single Phase, Self-Powered,
Suitable for 50 or 60 Hertz
Switch Selectable,
Mailed to: E, D, C/41-100C
Contact Output
Type
MICRO-51
MICRO-511FT
Curves (8)
Inverse, Very Inverse, Extremely Inverse,
Short Time Inverse, Definite Time,
L.T. Inv., L.T. Very Inv., L.T. Ext. Inv.
Inverse, Very Inverse, Extremely Inverse,
Short Time Inverse, Definite Time,
L.T. Inv., L.T. Very Inv., L.T. Ext. Inv.
Sensitive Target Coil: Add "_ST" to catalog number.
Retrofit Kit: Add "-LC" to catalog number.
Internal Connections: 16D446A, 10F446A
Continuous
Rating
4A
--_ ..
20A
4A
20A
To place an order, or for further information, contact the nearest District Office.
Internal Connection Diagrams
16D446A
Micro-51
Time-Overcurrent Relay
Drawout Test Case
TA" =LDH IMPEDAN[:E SE"IES TA"GET tDIL.
Descriptive Bulletin
41-123M
Page 5
CIRCUIT
8
SHIELD
Gl
Types MICRO-51 and
MICRO-511FT
Microprocessor-Based
Ti me-Overcu rrent
Relays
Time Unit
Pickup
Range
0.3-2.4A
1.5-12A
0.3-2.4A
1.5-12A
Instantaneous Range
(in multiples of
pickup setting)
1-20
1-20
1-20
1-20
10F446A
Micro-511FT
Time-Overcurrent Relay
FT-11 Flexitest Case
TIME
TAR
INST
TAR
TRIP
ALARM
Catalog
Number
446S1101
446S1201
446Fll01
446F1201
TAR = LOW IMPEDANCE TARGET COIL.
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