Senders

1. What is the difference between a sender and a switch?

   A switch creates a situation that is all or nothing. That is, it allows current to flow or not to flow. The current that flows is not graduated, and is suitable to actuate a pilot light. A sender gives a variable signal of graduated intensity that is suitable to actuate a gauge, indicating a certain level. For example, on a car, a remote switch operates the 'idiot light' that warns you're about to run out of gas: the sender drives the needle on the gas gauge. Our temperature switches have a mechanical contact that is actuated on or off with changes in the temperature surrounding the switch. Temperature senders have a resistive element that varies depending on the surrounding temperature. The temperature sender provides a resistance value to the gauge, causing the gauge to fluctuate.

2. Do you have other switches than what are listed in your catalog?

   Yes we have hundreds of parts that are not listed.
   Contact us to determine the part to fit your application.

3. Can I have a pressure or temperature switch modified to meet my needs?

   In most cases yes, if we do not already have a suitable part in stock.

4. What's the difference between an insulated and a non-insulated switch?

   In an insulated switch, the contacts are isolated from the chassis ground or engine block. In a non-insulated switch, the contacts short to the chassis ground or engine block when the switch makes, essentially providing a ground connection to your load. If the vehicle frame is non-conductive, you can't use a non-insulated switch. This is the case with most boats.

5. Can I use your non-insulated pressure or temperature switches with 110V AC?

   No. These switches are not rated for 110V AC application. Have a knowledgeable electrician determine suitability for your application.

6. Can I use your pressure or temperature switches to operate a gauge?

   No. You need a temperature or pressure sender. Sorry, Cole Hersee no longer manufactures Senders.
   The difference between senders and switches is that switches are either On or Off, and control a device such as a pilot light. Senders send a continuous variable signal and cannot be usded with On-Off devices such as a pilot light.

7. Can your pressure switches handle more pressure than the On/Off rated pressure?

   Generally yes. These switches have an On/Off rated pressure and a higher safe burst pressure. For your own safety your system pressure should be less than the burst pressure. Before you install a pressure switch, you should always determine your maximum system pressure first.

8. Can I use your pressure and temperature switches at 24V?

   Yes.