Ultra
Compact Rotary Switch

MR8A Series
Outline
MR8A is our tiniest rotary switch designed for compact devices, used for many different equipments
which has very limited space inside.

Features● 8mm square compact (8.0x8.0 mm)● Gold plated contacts● Monolithic sealed structure of the terminals to prevent entry of a soldering flux
● RoHS compliant● Waterproofed model available

Specifications
Operating temperature
Storage temperature

Mechanical
Specification

Electrical
Specification-20℃～ +70℃
-4F ～ 158F
-40℃～ +70℃
-40F ～ 158F

Keep the bodyunfrozen

Rotational
Torque0.02±0.01N･m

Terminal
Strength

3N (of static load applied to the tip of theterminal once and in any direction)

Rotation
StopperStrength

0.4N･mPanel Nut
Tightening
Torque0.8N･m

Heat
Resistance ofSolder

300℃ ±10℃ , 3±1 sec.

Water
Resistance

Water resistant through the mounted
panel (2m deep in the water for 2h)

Contact
Capacity

0.4VA (AC&DC)

Maximum
Voltage

25V (AC&DC)

Working
ElectricCurrent

0.1mA ～ 50mA (AC&DC)

Contact
Resistance

80mΩ max.

ElectricalSpecification

Insulation
ResistanceWithstanding
VoltageInsulation Resistance
WeightDurabilityHumidity Proof

500MΩmin. (250VDC): Between
terminals
1000MΩmin. (500VDC): Between
Terminals and Ground
300VAC 1min.: Between terminals
300VAC 1min.: Between terminals andground
DC100V(1min later)

terminal –terminal

100MΩ ≦

DC500V(1minLater)

terminal –ground

500MΩ ≦5.5g
50,000 strokes(Rotational Torque: ±20% the initialvalue, Contact Resistance: Not morethan 100mΩ, Insulation Resistance:
After 1min 250VDC electrification)
Temperature : +40 ± 2℃
Relative Humidity : 90 ～ 95%(Duration : 48 ± 2h)

Warranty● 1 year from the date of shipment.

Part Number Designation㻹㻾㻤㻭 㻙 㼂㻙㻝㻙 㻜㻥 㻙 㻟㻜 㻙 㻸㻩㻝㻞 㻙 㻾㻙㻿㻿㼠㼑㼜㻌㻭㼚㼓㼘㼑㻿㼣㼕㼠㼏㼔㻌㻹㼛㼐㼑㼘㻟㻜㻦㻌㻟㻜㼻㻯㼍㼠㼑㼓㼛㼞㼥㻸㼑㼚㼓㼠㼔㻌㼛㼒㻌㼠㼔㼑㻌㼟㼔㼍㼒㼠㻭㻦㻌㻾㼛㼠㼍㼞㼥㻌㻿㼣㼠㼕㼏㼔㻝㻞㻦㻌㻝㻞㼙㼙㻹㼛㼡㼚㼠㼕㼚㼓㻌㻰㼕㼞㼑㼏㼠㼕㼛㼚㻿㼔㼍㼜㼑㻌㼛㼒㻌㼠㼔㼑㻌㼟㼔㼍㼒㼠㼂㻦㻌㼂㼑㼞㼠㼕㼏㼍㼘㻾㻦㻌㻾㼛㼡㼚㼐㻼㼛㼘㼑㼟㻻㼜㼠㼕㼛㼚㼍㼘㻌㻼㼍㼞㼠㼟㻝㻦㻌㻝㻌㼜㼛㼘㼑㻞㻦㻌㻞㻌㼜㼛㼘㼑㼟㻺㼛㼚㼑㻦㻌㻺㼛㻌㼛㼜㼠㼕㼛㼚㻌㼍㼠㼠㼍㼏㼔㼑㼐㻿㻦㻌㻾㼑㼏㼑㼕㼢㼑㼞㻌㼏㼘㼍㼙㼜㻼㻦㻌㼃㼍㼠㼑㼞㼜㼞㼛㼛㼒㻌㼣㼍㼟㼔㼑㼞㻿㻼㻦㻌㻾㼑㼏㼑㼕㼢㼑㼞㻌㼏㼘㼍㼙㼜㻌㻒㻌㼃㼍㼠㼑㼞㼜㼞㼛㼛㼒㻌㼣㼍㼟㼔㼑㼞㻼㼛㼟㼕㼠㼕㼛㼚㼟㻜㻞䡚㻝㻞㻦㻌㻞䡚㻝㻞㻌㼜㼛㼟㼕㼠㼕㼛㼚㼟㻌㻔㻝㻌㼜㼛㼘㼑㻕㻜㻞䡚㻜㻢㻦㻌㻞䡚㻢㻌㼜㼛㼟㼕㼠㼕㼛㼚㼟㻌㻔㻞㻌㼜㼛㼘㼑㼟㻕Dimensions (mm)With Support
MR8A_S㻹㼛㼡㼚㼠㼕㼚㼓㻌㻼㼍㼚㼑㼘㻌㻦㻌㼠㻩㻌㻞㻚㻤㼙㼙㻌㼙㼍㼤㻚㻟㻚㻞㻡㻥㻚㻝With Seal Washer (Front panel seal)
MR8A_P㻹㼛㼡㼚㼠㼕㼚㼓㻌㻼㼍㼚㼑㼘㻌㻦㻌㼠㻩㻌㻞㻚㻥㼙㼙㻌㼙㼍㼤㻚㻌㻿㼑㼍㼘㻌㼃㼍㼟㼔㼑㼞㻌㻔㻝㻌㼜㼏㻕㼀㼛㼟㼛㼗㼡㻌㻸㼛㼓㼛㻹㼛㼡㼚㼠㼕㼚㼓㻌㻼㼍㼚㼑㼘㻌㻦㻌㼠㻩㻌㻞㼙㼙㻌㼙㼍㼤㻚㻌㻝㻚㻤㻡㻤㻡㻚㻢㻝㻝㻚㻢㻜㻚㻠㻤㻚㻥㻡㻥㻚㻝

㻟㻚㻞

㻠㻚㻣
㻝㻜㻚㻣

PWB Mounting Hole Dimensions (mm)With Support (& Seal Washer)

Seal Washer (2 pcs)

Seal Washer (2 pcs)

㻥㻤㻣㻤

㻠
㻡
㻢

㻝㻞㻝㻝
㻝㻜
㻥 㻤 㻣 㻯㻝㻝㻚㻢

Mounting Hole Dimension (mm)Standard / With Seal Washer

㻝㻚㻢

㻤
㻤㻚㻢

㻤

䈜Use 2 seal washers㻝㻠䠉䃥㻜㻚㻤
㻠㻙䃥㻝㻚㻞㻯㻞 㻝 㻞 㻟
㻠
㻝㻞㻡
㻝㻝
㻢
㻝㻜
㻥 㻤 㻣 㻯㻝㻝㻚㻢㻤㻤㻚㻢㻣㻚㻟
㻤㻯㻞 㻝 㻞 㻟㻣㻚㻟㻤㻤㻥 㻤 㻣 㻯㻝㻤

㻠㻡
㻢

㻝㻞
㻝㻝
㻝㻜

㻝㻚㻢

㻝㻚㻢

㻝㻚㻢㻝㻚㻢㻝㻞㻝㻝㻝㻜㻯㻞 㻝 㻞 㻟㻝㻟䠉䃥㻜㻚㻤㻠㻙䃥㻝㻚㻞㻝㻚㻟㻥㻚㻤㻟㻚㻞䈜㼁㼟㼑㻌㻞㻌㼟㼑㼍㼘㻌㼣㼍㼟㼔㼑㼞㼟㻝㻚㻢

Standard / With Seal Washer

䈜Use 2 seal washers㻝㻟䠉䃥㻜㻚㻤㻝㻠䠉䃥㻜㻚㻤㻟㻚㻡㼀㼛㼟㼛㼗㼡㻌㻸㼛㼓㼛㻿㼡㼜㼜㼛㼞㼠㻌㻔㼠㻩㻜㻚㻡㻕䠩㻢䠄㻼㻩㻜㻚㻣㻡䠅㻜㻚㻡䡐䠙㻜㻚㻞㻤㻡㻤㻜㻚㻡㻥With Support & Seal Washer (Front panel seal)
MR8A_SP㻝 㻿㼑㼍㼘㻌㼃㼍㼟㼔㼑㼞㻌㻔㻞㻌㼜㼏㼟㻕㻜䃥㻟㻚㻞 㻙㻜㻚㻝䠩㻢䠄㻼㻩㻜㻚㻣㻡䠅㻡㻚㻡㻝㻝㻚㻡㻜㻚㻡䡐䠙㻜㻚㻞㻤㻚㻡㻜㻚㻡䡐䠙㻜㻚㻞㻜㻡㻤㻢㻝㻞㻠㻡㻢㼀㼛㼟㼛㼗㼡㻌㻸㼛㼓㼛㻿㼡㼜㼜㼛㼞㼠㻌㻔㼠㻩㻜㻚㻡㻕䠩㻢䠄㻼㻩㻜㻚㻣㻡䠅㻜㻚㻡䡐䠙㻜㻚㻞

㻤㻡㻤㻯㻞 㻝 㻞 㻟㻝㻝㻚㻤㻜䃥㻟㻚㻞 㻙㻜㻚㻝㻹㼛㼡㼚㼠㼕㼚㼓㻌㻼㼍㼚㼑㼘㻌㻦㻌㼠㻩㻌㻟㻚㻟㼙㼙㻌㼙㼍㼤㻚㼀㼛㼟㼛㼗㼡㻌㻸㼛㼓㼛䃥㻟㻚㻞 㻙㻜㻚㻝㼃㼍㼟㼔㼑㼞㻺㼡㼠䠩㻢䠄㻼㻩㻜㻚㻣㻡䠅㻜䃥㻟㻚㻞 㻙㻜㻚㻝Standard
MR8A_Accessories

With Support (& Seal Washer)

NutWasher

Seal Washer (1 pc)㻤㻢㻚㻞㻤㻚㻡㻢㻚㻞㻤䈜䃥㻞㻚㻝㻜㻚㻠㻜㻚㻡㼃㼕㼠㼔㻌㼟㼑㼍㼘㻌㼣㼍㼟㼔㼑㼞㻘㻌㼗㼑㼑㼜㻌㼠㼔㼑㻌㼔㼛㼘㼑㻌㼏㼘㼛㼟㼑㼐㻚㻝㻚㻢㻡㻚㻞㻡䃥㻢㻚㻞䃥㻢㻚㻞