BRITISH STANDARDS INSTITUTION <br/><br/>
BS EN: 60255-3-1998: Electrical Relays- Part 3: Single input energizing quantity measuring relays with dependent or independent time. 

 - London  BSI  1998 
 - 11 
<br/><br/><label>ISBN: </label>0-580-30467-1 
<br/><br/><label>Universal Decimal Class. No.: </label> /