The Qualitrol 909 Series Seal-In Relay is designed to capture and maintain momentary or fast-acting contact closures, enabling reliable control of alarms and peripheral devices. It is commonly used in conjunction with Qualitrol 900/910 Rapid Pressure Rise Relays to ensure transformer protection during sudden pressure events. Its seal-in function ensures that transient signals are held long enough for downstream systems to respond effectively.
 
Reacts to momentary signals and maintains them for extended control
Eliminates issues with chattering contacts
Configurable for 24, 48, 125, 250 VDC and 120, 240 VAC
Supports flexible design integration
Two independent relays for simultaneous control operations
UL recognized for UL508; 909-300-02 also rated for UL1604 Class I Div II
LED indicators for trip and fault status
Available in two models: 909-300-01 and 909-300-02
Supports multiple voltage configurations
Manual reset switch