Siemens 7VK87 P1D78223

The 7VK87 P1D78223 is a SIPROTEC 5 breaker management and control relay from Siemens Energy, CT rated 1/5A, auxiliary supply range 100–250V AC/DC. This 7VK87 P1D78223 is dedicated for circuit breaker supervision, synchrocheck, auto-reclosing, breaker failure protection and bay control functions in medium voltage and high voltage switchgear bays. The 7VK87 P1D78223 supports 1A or 5A secondary current transformer input, matching standard switchgear CT wiring for current measurement and fault detection.

This 7VK87 P1D78223 features a modular hardware design, configurable via DIGSI 5 engineering software. It integrates multiple binary inputs and relay outputs for interlocking, control command and alarm signalling. The front LCD panel provides local status display, measured values, fault event records and manual operation. It supports IEC 61850, Profibus and other communication protocols to connect with substation SCADA and bay control systems. Conformal coated PCB is available for harsh substation environments.

The 7VK87 P1D78223 is widely used in power substations, industrial switchyards and power plant switchgear for breaker condition monitoring, synchronisation check and automatic reclosing control. The SIPROTEC 5 7VK87 platform is the latest generation breaker management relay. Many power system maintenance teams stock the 7VK87 P1D78223 as spare relay for bay retrofit and emergency replacement of existing switchgear control units.