Terminal Block 30 Ampere 4 Circuit. PN: 2504. Closed back design completely insulates power from the mounting surface. Each screw pair is 1 isolated circuit. Jumpers allow creation of common circuits. SPECIFICATIONS. Bus Material. Nickel-Plated Brass. Base Material. Phenolic. Screw Size. #8. Continuous Rating. 30 Amperes AC/DC. Voltage Rating. 600 Volts AC/DC Maximum. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.