It's a Metal Oxide Varistor, manufactured by HARRIS

AC working voltage = 175 volts
DC working voltage = 225 volts
Transient energy = 55 Joules
Peak transient current = 4500 Amps
Varistor voltage @ 1ma Min=247, Nom = 270, Max = 303

Hope that helps!!

Mike Rigby-Jones

> -----Original Message-----
> From: Max Toole [SMTP:MaxToole@AOL.COM]
> Sent: Friday, August 27, 1999 12:46 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [OT] Part identification
>
> I need to know the identity of a part that I think is a varistor.  It is
> dark
> red, looks similar to a disc ceramic capacitor and has the markings:
>
> H A3
> 175L10
>
> On the circuit board, it has a reference designator of RV1.
>
> Does anyone have an idea who the manufacturer might be and what the device
> is?  I think it is used for surge suppression in the circuit.
>
> I really appreciate any help from anyone.
>
> Max