Product Overview Mini-Circuits’ MSP4TA-18D+ is an ultra-reliable, rugged-duty absorptive fail-safe SP4T switch designed in break- before-make configuration offering an Ultra long switching life. Powered by +24VDC, the device has a typical switching speed of 20 milliseconds, insertion loss of 0.2 dB and high isolation of 90 dB. The MSP4TA-18D+ is suitable for use across a wide range of applications, including switching for automated test equipment and redundancy switching.