Usage of fuse as a protection of MOV or SPD 04.Mar.2011 1. Company - - PowerPoint PPT Presentation

04.Mar.2011

Usage of fuse as a protection of MOV or SPD

• 1. Company profile

 Foundation

Foundation

• 15. Jun. 1948
• 15. Jun. 1948

 Capital

Capital 95 million Yen 95 million Yen

 Sale

Sale 2 billion Yen 2 billion Yen

 Head office

Head office Meguro Tokyo Meguro Tokyo

 Domestic base Shinagawa, Tsukuba, Osaka

Domestic base Shinagawa, Tsukuba, Osaka

 Overseas factory China

Overseas factory China

 Group company

Group company Daitonagasawa Daitonagasawa, Daito , Daito Com Com(HK (HK) ), , Daito Create Daito Create

• 2. Our fuse business

50% 31% 15% 4%

2009

Information Communication Industrial instrument Consumer product

Other

• IBS
• Base station equipment of

mobile communication

• Disaster prevention radio

communication

• broadcast facility
• ONU
• Railway, traffic system
• Process automation
• Factory automation
• Machine tool
• Manufacturing equipment
• Electric equipment
• Security
• Digital equipment
• OA equipment
• Copier
• New energy equipment
• Automotive
• Home electronics appliance

• 3. Introduction of surge countermeasure

products for DC quick charger

3-1. Necessity of SPD back-up device 3-2. Usage of SPD and Fuse 3-3. Fuse selection from lightning surge 3-4. Introduction of relevant products

3-1. Necessity of SPD* back-up device

Failure mode Short mode ⇒ line short, ignition , down Equipment 【Feature of fuse】

• Compact size.
• High breaking capacity.
• Quickly cutoff .
• Because of small reactance, the occurrence voltage by surge current is small.
• Enable cut off by surge current, before breaking MOV.

* Type of voltage limitation SPD ⇒ MOV / varistor

For averting secondary disaster, need back-up of MOV!

3-2．Usage of SPD and fuse

Equipment Purpose and setting place of fuse Protect SPD & Equipment ⇒ Need a fuse replacement to equipment recovery. Not stop an equipment ⇒ Need a main fuse on circuit line other than back-up fuse.

3-3．Fuse selection from lightning surge

Im 0.5Im t1 t２ Calc.： Joule integral of surge current ÷ surge rating * ＜ Joule integral of fuse

Joule integral of surge current = Im2 { t1/3 + 0.721 (t2 – t1) }1.3

* Please contact us about surge rating factor

If have an any question, please feel free contact us. It is best short cut. Ex) surge spec ⇒ 8/20μｓ 20kA 2 times in this condition

3-4．Introduction of relevant products.

KLA2 20A, 30A KLA2 50A

① MOV / SPD back-up fuse： Type KLA

size：φ10.8×38mm size：φ14×51mm

【Feature】

• High surge tolerated dose & low rated current
• Correspondence to class2 SPD
• Enable easy co-ordination with upper level NFB
• More compact than in existence back-up fuse

1.5mΩ 20kA 40kA 50A KLA2 50A 2.0mΩ 10kA 20kA 30A KLA2 30A 3.5mΩ AC 250V 10kA 5kA 10kA 20A KLA2 20A In 20times Imax 2 times Resistance Breaking capacity Surge rating 8/20μs Rated current

• Cat. No.

* There are terminal types too. If you have any request, please contact us.

② Alarm fuse built-in SPD： Type FZ / FZ unit

【Feature】

• Built-in fuse operating when MOV degradation
• Alarm will function when built-fuse operated
• Visual fault indicator
• Easy maintenance by plug-in design

FZ FZ unit Holder

* There are many types of holder.

FZ Load

アラーム

3-4．Introduction of relevant products.

Size： 32×22×35mm 49×33×36.7mm

Thank you for your attention.

【Contact】 Daito Communication Apparatus Co., Ltd. Sales dept. Contact person： Yusuke Isomura TEL：+81-3-3495-6711 E-mail：yu_isomura@daitotusin.co.jp