Electronic Components Blog

Monday, 11 July 2016 13:33

Portable Defibrillators Use Reed Relays

Portable Defibrillators Use Reed Relays

Reed relays are reliably used in portable battery operated defibrillators. Instruments that directly save lives require the best possible designs, and must use the most reliable components available. Portable defibrillators are designed so that anyone can pick up and use them with no prior experience. They are only used for emergencies in life and death situations.

When repeated shocks are required, a charging circuit in the defibrillator is activated to charge the responsible circuit that will supply the next power burst. This charging circuit needs to be switched in and out in a reliable manner in a guaranteed fault free mode. Standex-Meder’s special BE series design was chosen to meet the these requirements.

Standex-Meder’s design is a 2 pole normally open relay that has a special spacing between the switches and coil to maintain a long path length, thereby insuring a guaranteed high isolation voltage between the coil and the switches. The design uses no internal solder joints on the reed switches to insure switching reliability. The reed switches are selected to withstand 4000 Volts minimum across the open contacts. The contacts can also switch up to 1000 volts as well. Due to hermetical sealing and high strength packaging, the components can be subject to various environments and wide temperature ranges without any loss of reliability.

• Several hundred million operations
• Ability to withstand up to 4000 volts across the contacts
• Ability to Switch up to 1000 Volts
• Ability to hold off 5000 volts between switch to coil
• Contacts dynamically tested

Please contact your Heynen rep. for more (purchasing) information.