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lit
1-
August, 1991
Supersedes Descriptive Bulletin 41-123M,
page 3, dated January 1, 1991
Mailed to: E, D, C/41-100C
T y pe
Curves (8)
Inverse, Very Inverse, Extremely Inverse,
Short Time Inverse, Definite Time,
MICRO-51
L.T. Inv., L.T. Very Inv., L.T. Ext. Inv.
Inverse, Very Inverse, Extremely Inverse,
MICRO-511FT
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
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.
ABB Power T&D Company Inc.
Relay Division
Coral Springs, FL
Allentown, PA
Single Phase, Self-Powered,
Suitable for 50 or 60 Hertz
Switch Selectable,
Contact Output
Continuous
Rating
4A
--_ ..
20A
4A
20A
TAR = LOW IMPEDANCE TARGET COIL.
8
CIRCUIT
Types MICRO-51 and
MICRO-511FT
Microprocessor-Based
Ti me-Overcu rrent
Relays
Time Unit
Instantaneous Range
Pickup
(in multiples of
Range
pickup setting)
0.3-2.4A
1-20
1.5-12A
1-20
0.3-2.4A
1-20
1.5-12A
1-20
10F446A
Micro-511FT
Time-Overcurrent Relay
FT-11 Flexitest Case
TIME
TAR
INST
TAR
TRIP
ALARM
Descriptive Bulletin
41-123M
Page 5
Gl
SHIELD
Catalog
Number
446S1101
446S1201
446Fll01
446F1201
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