Relays
MC line
General Characteristics
The MC line has been designed to offer to the market a very competitive protective relay
responding to the latest requirements in terms of control and communication capabilities
with an extremely high level of modularity. Each relay includes a limited number of protective
functions but, thanks to their very compact sizes, different units can be combined in a modular
enclosure to satisfy the most demanding needs.
Measurements
• Real Time Measurements
• Trip Recording
(last 20 trips with date & time)
• Event recording (last 10 trips)
Control
• 4 Output Relays (programmable)
• 3 Digital Inputs
• Time tagged multiple event recording
• Oscillographic wave form capture
• Blocking Outputs and Blocking Input
for pilot wire selectivity coordination
• Associate C.B. control
Technical Characteristics
• Complete self diagnosis program
• Display LCD 16 (2x8) characters
• 4 Leds for signalization
Communications
• 1 RS485 Serial communication
port on rear side
• 1 RS232 Serial communication
port on front panel
• Modbus RTU/IEC870-5-103/IEC61850
Communication Protocols
Expansion Modules (optional)
• “UX10-4” 10 Digital Input and
4 Output Relays
• “14DI” 14 Digital Inputs
• “14DO” 14 Output Relays
Execution
• 1 Module box (2 modules with expansion)
• Totally draw-out execution
• IP44 protection case (on request IP54)
Software
• MSCom2 Program interface for device
management
Relays Type
MC1V
MC3V
MC20
MC30
MC40
MC20-R
MC30-R
MC30-BC
MCDC-I
MCDC-V
MCM
Multifunction Single Phase Overvoltage/Undervoltage Relay: 59, 27, 81>, 81<
Multifunction Three Phase Overvoltage/Undervoltage Relay: 59, 27, 81>, 81<, 59Vo, 59V2, 27V1
Overcurrent & Earth Fault Relay: 50/51, 50N/51N, 51BF
Three Phase Overcurrent & Earth Fault Relay: 49, 50/51, 50N/51N, 51BF
Three Phase Overcurrent & Earth Fault (connection with 4 CT ‘s): 49, 50/51, 50N/51N, 51BF
Overcurrent & Earth Fault Relay: 50/51, 50N/51N, 51BF, 79
Three Phase Overcurrent & Earth Fault with reclosing function Relay: 50/51, 50N/51N, 51BF, 79
Three Phase Overcurrent & Earth Fault + Broken Conductor Relay: 50/51, 50N/51N, 51BF, BC (I2/I2)
D.C. Current Relay: 76/32, 49, 51BF
D.C. Voltage Relay: 45, 80
Motor Protection Relay: 37, 46, 47, 48, 49, 50/51, 51LR, 64S, 66, 68
Wiring Diagram
6
7
6
7
7
5
8
4
5
Ion=
1A
1A
1A
1A
1/5A
1/5A
9
R2
R2
18
R3
17
OUTPUT
14
RELAYS
F50
F51
F50N
F51N
R1
R1
R2
F50N
R4
F51N
R4
17
R4
OUTPUT
14
RELAYS
15
R3
INT.FAULT
D3
D2
D1
R4
12
15
13
12
13
R2
R3
INT.FAULT
18
F50
R3
F51
FUNCTION
1/5A
9
16
16
FUNCTION
MICROP.
1/5A
8
8
9
R1
MC20
5
5
9
In=
In=
Ion=
4
4
8
MC20
DISPLAY
1/5A
R1
MICROP.
1/5A
7
6
4
DISPLAY
6
D3
D2
20
D1
21 DIGITAL
19 INPUTS
20
21 DIGITAL
19 INPUTS
22
22
5A
5A5A
5A
10
AUXILIARY
AUXILIARY
SUPPLYSUPPLY
11
C
A (S+)
B (S-)
10
11
KEYBOARD
MS-SCE1828-R1
MS-SCE1828-R1
BPMC
3
2
1
RS485
C
A (S+)
B (S-)
3
2
1
RS485
KEYBOARD
BPMC
135
164
Overall Dimensions: mm
83
1 MODULE
PANEL CUT-OUT
64X137 (LXH)
2
195
213
225
Microelettrica Scientifica S.p.A. Via Lucania, 2 20090 Buccinasco - Italy
Tel.: +39 02 575731 Fax: +39 02 57510940 - sales.relays@microelettrica.com - www.microelettrica.com