MITSUBISHI MATERIALS CORPRATION Ver.1.0
Thank you very much for purchasing our Mitsubishi Materials LITOL Line Surge Protector. Please refer to these explanations
before installing and using it
１． We developed the LITOL Line Surge Protection Device (SPD) to effectively protect all types of electronic equipment
and machinery from induced surge voltages from lightning and from electrical noise. A typical application for it is a control
or switchboard for a building and it is compliant with IEC 616443-11:2011 standard (Class 2) lightning tests
２．Line up：
Part#
Maximum
Continuous
operating voltage
Uc
Nominal
discharge
current In
Maximum
discharge
current Imax
Voltage protection level
Up
Operating
Indicator
LTM-125RF
AC150V
Single-phase 3
wires
10kA
(8/20μs)
20kA
(8/20μs)
Line - Line 1.2kV
Yes
Line – Earth 1.5kV
LTM-250RF
AC275V
Three-phase 3 wires
10kA
(8/20μs)
20kA
(8/20μs)
Line – Line 1.5kV Yes
Line – Earth 1.5kV
LTM-400RF
AC510V
Three-phase 4 wires
10kA
(8/20μs)
20kA
(8/20μs)
Line – Line 2.5kV Yes
Line – Earth 2.5kV
LTM-125R
AC150V
Single-phase 3
wires
10kA
(8/20μs)
20kA
(8/20μs)
Line - Line 1.2kV
－
Line – Earth 1.5kV
LTM-250R
AC275V
Three-phase 3 wires
10kA
(8/20μs)
20kA
(8/20μs)
Line – Line 1.5kV －
Line – Earth 1.5kV
LTM-400R
AC510V
Three-phase 4 wires
10kA
(8/20μs)
20kA
(8/20μs)
Line – Line 2.5kV －
Line – Earth 2.5kV
３．Accessories:
•LITOL instructions (this document)
•4(LTM-400R/RF has 5) x 1.2m long 2mm2 insulated wires, terminated with φ4mm ring tongue on one side, φ8mm ring on the
other.
Main unit weight(excludes wiring): LTM-125R/250R≈700g, LTM-125RF/250RF≈730g, LTM-400R≈750g, LTM-400RF≈780g
４．Operating Condition
Operating Conditions are -25℃ to 85℃, indoor conditions or a location where water will not ingress.
５. Precautions for use:
① Grounding to Earth needs to be class D or above. Connect lead securely to terminal and follow good connection guidelines.
② Connect device with included wire. If you use other wire, make sure the wire is larger than 2.0 - 5.0mm2.
③ Affix device and wiring securely to protect it from damage.
④ This SPD isn’t waterproof. Its location should protect it from high temperatures or humidity, direct sunlight, dust,
or corrosive gas.
⑤ This protects from induced surges from power lines but doesn’t protect surges on communication lines. It is possible
for there to be a surge so large it enters past the protector and it cannot 100% protect, so damage to devices connected
to it as well as the operation of devices which can harm human life or cause other damage to intellectual property
or data are not covered.
⑥ Remove from circuity if performing a Megger test.
６．Wiring
Single-phase three wire Single-phase Three-phase three wire
Three-phase four wire
７.Dimensions
８．Maintenance and Inspection
You should only check the indicator light with the power
connected. Everything else needs to be checked with power cut
to it.
For the LTM-RF series, confirm the LED is lit as right with the power on. If the LED isn’t lit, replace the unit immediately.
Make sure the ground is less than 100Ω.
９．Warrantee
If there are any manufacturing defects in our SPD we will repair or replace it with equivalent for 1 year from the date
of purchase.
This will not prevent damage from a DIRECT lightning strike to it. If a lightning strike exceeding its rating hits it, it
may not be able to protect itself or other electronic devices downstream from it.
R S T E
R
N
T
E
R N T E
LTM-125R
漏電遮断器 被保護機器
D
種接地以上（
100Ω
以下）
R S T E
R
N
E
R N T E
LTM-125R
漏電遮断器 被保護機器
D
種接地以上（
100Ω
以下）
R S T E
R
S
T
E
R S T E
LTM-250R
漏電遮断器 被保護機器
D
種接地以上（
100Ω
以下）
R
S
T
N
LTM-400R
漏電遮断器 被保護機器
D
種接地以上（
100Ω
以下）
PE
R S T N PE
【How to connect】
① Check to assure no power is running by turning off the associated
circuit breaker and/or testing the wires for electricity. You may
get a dangerous shock if you do not do this.
② Connect to the secondary side of earth leakage circuit breaker；
ELB, or the secondary side of an unused breaker. In the former
case, the Megger test will be achieved easier with a breaker
installed between LTM series and ELB.
③ Connect the included wires to the main unit.
④ Remove the cover over the terminals on the unit and connect the
colored wires to the correct terminals. Replace the cover
⑤ Attach the unit to a secure location with 4 screws.
⑥ Attach the insulated wires to the secondary side of the earth
leakage breaker or the secondary side of the unused branch
breaker.
⑦ Turn on the earth leakage breaker and the breaker.
LTM-125R,LTM-125RF LTM-250R,LTM-250RF
LTM-400R,LTM-400RF
※
Use a dedicated secondary breaker and turn off for new installation or for
replacing this unit.
Unit:mm
Less than 100Ω
Switchboard
Switchboard Device Device Switchboard Device
Switchboard Device
Electronic Materials Business Company, Electronic Device Division Sales Department;
1-6-1 Yokoami Sumida-ku, Tokyo (International Fashion Center Building 8F), 130-0015 Tokyo
TEL: +81-3-5819-7322 FAX: +81-3-5819-7323
Nagoya Sales Office; 2-4-3 Nishiki Nakaku-ku Nagoya-shi, Aichi Prefecture 460-0003 (Nishiki Park Building 14F)
TEL: +81-52-223-4508 FAX: +81-52-223-4522
Osaka Branch; 1-8-30 Tenmabashi Kita-ku Osaka-shi Osaka Prefecture 530-6028 (OAP Tower 28F)
TEL：+81-6-6355-5004 FAX：+81-6-6355-5032
LTM-125R,LTM-125RF
Less than 100Ω Less than 100Ω
Less than 100Ω
Model LTM-125RF LTM-250RF LTM-400RF
LTM-125R LTM-250R LTM-400R
protecting.
If off, replace
immediately
Single Phase Single or Three-Phase 3 wire
or Three-Phase 4 wire
On
protecting.
If off, replace
immediately
LTM-RF Series LED Indication meaning
LITOL
