GE Multilin MIF series digital feeder relay

Local operation: Front panel buttons for direct parameter adjustment and status viewing;

Indicator lights (LEDs): LED indicator lights can be configured to visually display the device's operating status and fault type.

Wiring and safety regulations

1. Typical wiring reference

Grounding detection wiring: Two options are available - ① Three phase CT residual current summation (no additional sensors required); ② Zero sequence grounding CT (sensitive detection scenario);

Current input: It is recommended to use a 14 AWG (2.5mm ²) wire, and the terminal should be a fork or ring terminal;

Safe grounding: It is necessary to connect to a safe ground. Terminals B12, A12, and B11 are only for connecting SELV (safety extra low voltage) components (such as PLC), and withstand voltage testing is prohibited.

2. Safety Tips

Overvoltage category: Class II, suitable disconnect devices (switches or circuit breakers) need to be installed near the relay;

Internal fuse: The power circuit is equipped with a 1A/250V fast fuse to protect the equipment in case of malfunction.

Ordering information (model coding rules)

The MIF series model code format is * * MIF * * * * E * 00 * 00 * * *, and the meanings of the characters in each position are as follows, which need to be combined according to actual needs:

Encoding Position Optional Character Meaning Explanation

1st to 3rd digit MIF product identification (digital feeder relay)

The 4th P/N P=three-phase+grounding relay; N=single-phase or grounded relay

5th A/I A=ANSI standard curve; I=IEC standard curve

6th position 0/1/5=MIF-N type; 1=MIF-P type (I n=1A, setting range 0.1-2.4A); 5=MIF-P type (I n=5A, setting range 0.5-12A)

7th position 1/5/N grounding CT rated current: 1=1A (0.1-2.4A); 5=5A（0.5-12A）； N=sensitive grounding (1A, 0.005-0.12A)

8th position (empty)/1/2 empty=base model (no options); 1=Option 1 (configurable I/O, event logging, recording); 2=Option 2 (including option 1 function+cold load input, circuit breaker failure/health monitoring, configurable logic)

The power specifications for positions 9-10 are 24-48V DC/AC (19-58V DC); 110-250V DC（88-300V DC）； 110-230V AC（88-264V AC）

The installation method for positions 11-12 is empty=independent relay; M+=Installed on M+system (requires additional order of M050 half 19 inch rack or M100 full 19 inch rack, provided free of charge according to the number of relays)

Example

MIF P A 1 1 2 110: Three phase+grounding relay (P), ANSI curve (A), phase CT I n=1A (1), grounding CT I n=1A (1), including option 2 function (2), 110-250V DC power supply (110).