12 Volt Bear DC Contactor. MurCal is an Authorized Distributor of Trombetta products. As an approved and authorized distributor, MurCal stocks and ships each product order from our warehouse in Palmdale, California. MurCal provides application and product support, before and after the sale. Our in-house technical sales representatives have been trained by Trombetta and have the knowledge necessary to answer your questions. When you make an important purchase decision, be sure to consider the company that provides Trombetta's factory authorized sales and service.