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

Usage of fuse as a protection of MOV or SPD 04.Mar.2011

1. Company profile Foundation 15. Jun. 1948  Foundation 15. Jun. 1948  Capital 95 million Yen  Capital 95 million Yen  Sale 2 billion Yen  Sale 2 billion Yen  Head office Meguro Tokyo  Head office Meguro Tokyo  Domestic base Shinagawa, Tsukuba, Osaka  Domestic base Shinagawa, Tsukuba, Osaka  Overseas factory China  Overseas factory China  Group company Daitonagasawa Daitonagasawa, Daito , Daito Com Com(HK (HK) ), ,  Group company  Daito Create Daito Create

2. Our fuse business • IBS • Base station equipment of 4% Other mobile communication • Digital equipment • Disaster prevention radio 15% • OA equipment communication • Copier • broadcast facility Consumer • New energy equipment • ONU product • Automotive • Home electronics appliance 50% 2009 • Railway, traffic system • Process automation Industrial Information • Factory automation instrument • Machine tool Communication 31% • Manufacturing equipment • Electric equipment • Security

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 * Type of voltage limitation SPD ⇒ MOV / varistor Failure mode Equipment Short mode ⇒ line short, ignition , down For averting secondary disaster, need back-up of MOV! 【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.

3-2．Usage of SPD and fuse Purpose and setting place of fuse Equipment 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 Ex) surge spec ⇒ 8/20μｓ 20kA 2 times in this condition 0.5Im t 1 t ２ 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.

3-4．Introduction of relevant products. ① MOV / SPD back-up fuse： Type KLA KLA2 20A, 30A 【Feature】 size：φ10.8×38mm • High surge tolerated dose & low rated current • Correspondence to class2 SPD KLA2 50A • Enable easy co-ordination with upper level NFB • More compact than in existence back-up fuse size：φ14×51mm Surge rating 8/20μs Breaking Resistance Rated Cat. No. capacity current Imax 2 times In 20times KLA2 20A 20A 10kA 5kA 3.5mΩ AC 250V KLA2 30A 30A 20kA 10kA 2.0mΩ 10kA KLA2 50A 50A 40kA 20kA 1.5mΩ * There are terminal types too. If you have any request, please contact us.

3-4．Introduction of relevant products. ② Alarm fuse built-in SPD： Type FZ / FZ unit FZ FZ unit Holder * There are many types of holder. Size ： 32 × 22 × 35mm 49 × 33 × 36.7mm FZ 【Feature】 • Built-in fuse operating when MOV degradation Load • Alarm will function when built-fuse operated • Visual fault indicator • Easy maintenance by plug-in design アラーム

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