MMAJ
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8155 Rev.2 P. 3 / 4
TERMINAL CONNECTIONS
Connect the unit as in the diagram below.
■
CONNECTION DIAGRAM
MDJST
6
5
4
3
–
+
4 – 20mA DC
MMAJ-100
V
U
v
u
100V AC
V
U
G
G
PE
A2
A1
*
1. Sections enclosed with broken line are applicable for “alarm
output” option.
The schematic shows the relay contact status of a thermal trip
or power off.
*
2. Be sure to make a cross-wire. If the protected device has no
earth terminal, earth only the MMAJ.
*
2
Protected Device
A MCCB
must be installed.
MCCB
*
1
C
■
EARTHING
M-RESTER
PROTECTED
DEVICE
G
PE (G)
CROSSOVER WIRE
EARTHING
(100 ohms or less)
A crossover wire between M-RESTER and earth or the
metallic housing of device is required for protection.
DERATING CURVE
100
50
0
-5 0
20
40
60
55
20A
30A
10A
Ambient Air Temperature (°C)
Load Rate (%)
WIRING
■
LEADWIRES
Conductor cross-section area: 5.5 mm
2
minimum for U, V
and PE lines. However, a local industrial standard require-
ment for wiring should take precedence.
The wire length should ideally be less than 0.5 meters. Ex-
tra long wires should not be bundled in coils, but be cut to
the minimum required length.
■
SOLDERLESS TERMINAL
Applicable ring tongue terminal without insulation sleeve
is as indicated below. Spade tongue terminal must conform
with the ring type size.
In order to ensure IP20 protection (IEC 60529) with a sol-
derless terminal, cover the terminal with a insulation cap
to prevent direct touching by a hand.
F
d : M4 use
B
≤
11.0 mm
F
≥
5.5 mm
(
F
≥
7 mm
for sharing terminals)
T
≤
1.5 mm
• Applicable Solderless Terminal Size
diameter
d
B
T
■
TORQUE
Tighten the screw terminals securely. Maximum allowable
torque is of 1.2 N·m.
ALARM OUTPUT
The power supply voltage is continuously applied to the in-
corporated discharge element (zinc oxide element). Degrad-
ed element is automatically separated from the power lines
for safety to prevent overheating caused by leakage current.
Optional SPDT relay output is available to alert when the
thermal breaker has separated the discharge element from
the power supply circuit.
If the alarm output should be transmitted remotely via
outdoor cables, a surge protector for signal line is required.
Choose a circuit breaker with an alarm output. Configure a
logical addition sequence so that the alarm trips when both
or either of the M-RESTETR or the breaker alarm trips.
■
RELAY SPECIFICATIONS
Alarm output: The SPDT relay trips when the thermal
breaker operates and/or power source shutdown.
Rated load: 250V AC @1A (resistive load)
24V DC @1A (resistive load)
OUTPUT
TERMINAL
NORMAL
THERMAL BREAKER OPERATING OR
POWER OFF
A1 – C
Open
Close
A2 – C
Close
Open
■
CONNECTION
Terminal: Tension clamp
Applicable wire size: 0.33 to 1.5 mm
2
( 6 – 7 mm exposed)
