Chess Electric

Engineered solutions for connecting, monitoring, protecting power systems and critical equipment.


Phone: 1-877-400-0106

Multilin 350

Intuitive and innovative feeder protection system

The Multilin™ 350 is a member of the Multilin 3 Series protective relay platform and has been designed for the protection, control and management of feeders or related applications as a primary or backup protection device. This cost-effective protective device is used to perform advanced feeder protection, control and monitoring for low, medium and high voltage applications. The 350 also offers enhanced features such as integrated arc flash protection, metering, monitoring and diagnostics, preventative maintenance, advanced communications and security.

The 350 protection relay chassis used with a draw out relay is available separately, for use as a partial replacement or in test environments. The draw out relay with no chassis is also available to order as a spare unit.

Multilin 350

Key Benefits

  • Cost-effective and flexible protection and control
  • Field-proven algorithms and reliable protection to avoid unwanted trips or under-protection
  • Ease of use and standardization with one-step setup and universal CT inputs
  • Environmental monitoring system to monitor operating conditions and plan preventative maintenance
  • Advanced power system and switchgear diagnostics
  • Flexible communications with multiple ports and protocols allowing seamless integration
  • Arc flash mitigation via zone inter-tripping, flex curves and multiple elements and setting groups
  • Integrated arc flash detection using light sensors supervised by over current to reduce incident energy and damage
  • Powerful Security and hierarchical password control for centralized management
  • Application flexibility with the use of programmable logic elements
  • Drawout design simplifies, commissioning and maintenance, thereby increasing process uptime
  • Increased network availability with zero failover time through IEC® 62439-3 PRP and HSR support
  • Precise time synchronization through IEEE® 1588 (Precise Time Protocol (PTP)) support
  • Robust design exceeding industry standards, with Automotive Grade components and advanced testing procedures such as accelerated life cycle testing
  • Simplified migration of legacy MII Family relays to the 3 Series platform
  • Intuitive configuration software and user-friendly logic configuration tool


  • Primary protection and control for medium and high voltage utility and industrial overhead or cable feeder applications
  • Protection of small and medium size distribution transformers
  • Back-up protection of various HV applications
  • Capacitor bank protection
  • Advanced control applications including Cold Load Pickup, multi-shot recloser and multiple setting groups