Littelfuse delivers vital products to address customer needs for protecting and safely controlling electrical power. Our single-function & control relays product portfolio includes 12 series of delay-on-break time-delay relays that start delay cycles when input voltages are removed. Each version boasts excellent repeat accuracy. Available features include solid-state components, encapsulation, and LED indicators. Browse the Littelfuse delay-on-break relay selection to find the ideal product for your needs.

 

Features

• Ac input voltages from 24 V ac to 240 V ac
• Dc input voltages from 12 V dc to 240 V dc
• Fixed or selectable time delays from 100 ms to 600 s
• Repeat accuracy of ±0.5 % or 20 ms, whichever is greater
• Operate at temperatures ranging from –40 °C to +85 °C
• Reset times ≤ 150 ms
• Initiate times ≤ 20 ms
• Time delays vs. temp. & voltage ≤ ±10 %
• Ac line frequency/Dc ripple of 50/60 Hz with accuracy within 10 %
• UL Listed or UL Recognized

 

Benifits

• Available with DPDT output circuitry, SPDT output circuitry, or normally open (Form A) contacts
• Available with analog or microcontroller-based circuitry
• Available with customized delays
• Compact designs and low weight

Model	Image	Description
HRDB Series		The HRDB Series combines an electromechanical, relay output with microcontroller timing circuitry. The HRDB offers 12 to 230V operation in five options and factory fixed, external, or onboard adjustable time delays with a repeat accuracy of ±0.5%.
HRIS Series		The HRPS/HRIS Series combines an electromechanical relay output with microcontroller timing circuitry. It is a factory programmed module available in any 1 of 13 standard functions. It offers 12 to 240V operation in two universal ranges and factory fixed, onboard, or external adjustable time delays with a repeat accuracy of ±0.5%.
KRDB Series		The KRDB Series is a compact time delay relay measuring only 2 in. (50.8 mm) square. Its microcontroller timing circuit provides excellent repeat accuracy and stability. Encapsulation protects against shock, vibration, and humidity. The KRDB Series is a cost effective approach for OEM applications that require small size, isolation, reliability, and long life.
KRPS Series		The KRPS Series is a factory programmed time delay relay available with 1 of 15 functions and measures only 2 inches square. The KRPS offers a wide range of fixed, onboard, or externally adjustable time delays. The output relay contacts offer a full 10A rating with complete isolation.
KSDB Series		The KSDB Series is designed for general purpose commercial and industrial applications where a small, cost effective, reliable solid-state timer is required. The factory calibration for fixed time delays is within 5% of the target time delay. The repeat accuracy, under stable conditions, is 0.5% of the selected time delay.
ORB Series		The ORB Series’ open PCB construction offers the user good economy without sacrificing performance and reliability. The output relay is available in isolated, 10A, DPDT or SPDT forms. The time delay may be ordered as factory fixed, onboard knob, or external adjustment. All connections are 0.25 in. (6.35 mm) male quick connect terminals.
TDB Series		The TDB series combines accurate digital circuitry with isolated, 8 A, DPDT or SPDT contacts in an 8-pin or 11-pin plug-in package. The TDB series features DIP switch selectable time delays ranging from 0.1–10,230 seconds in three ranges. The TDB series is the product of choice for custom control panel and OEM designers.
TDUB Series		The TDUB Series combines digital timing circuitry with universal voltage operation. Voltages of 24 to 240VAC and 12 to 24VDC are available in three ranges. The TDUB Series offers DIP switch selectable time delays ranging from 0.1 seconds to 102.3 minutes in three ranges.
THDB SERIES		The THDB Series combines accurate timing circuitry with high power, solid-state switching. It can switch motors, lamps, and heaters directly without a contactor. You can reduce labor, component cost, and increase reliability with these small, easy-to-use, timers.
TSB SERIES		The TSB Series is a totally solid-state, delay-on-break timing module. The TSB series is available with a fixed, external, or onboard adjustable time delay. Time delays from 0.05 to 600 seconds, in 4 standard ranges, cover over 90 % of all OEM and commercial appliance timing applications.