© 2016 Littelfuse Protection Relays & Controls

www.littelfuse.com/

Rev: 1-A-062216

Time Delay Relays

Dedicated - Delay-on-Break

www.littelfuse.com/hrps-hris

HRPS / HRIS SERIES

Description

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%. The output contact rating allows for direct

operation of heavy loads, such as compressors, pumps, blower

motors, heaters, etc. This series is ideal for OEM applications

where cost is a factor. The HRPS has non-isolated SPDT relay

contacts, and the HRIS has isolated SPDT relay contacts. Both

offer the most popular timer functions in the industry.

Operation (Interval)

Upon application of input voltage, the time delay begins. The

output (relay or solid state) energizes during the time delay. At

the end of time delay the output de-energizes and remains

de-energized until input voltage is removed.

Reset: Removing input voltage resets the time delay and output.

Features & Benefits

FEATURES

BENEFITS

Microcontroller based

Repeat Accuracy + / - 0.5% ,

factory calibration +/- 2%

Compact design

Allows flexiblility for OEM applications

30A, SPDT, Normally

Open output contacts

Allows for direct operation of heavy loads

Encapsulated

Protects against shock, vibration, and humidity

L1

N/L2

HRPS

Relay contacts are

non-isolated.

L1

N/L2

HRIS

Relay contacts

are isolated.

S1 = Initiate Switch

UTL = Untimed Load (optional)

NO = Normally Open

NC = Normally Closed

C = Common

A knob, or terminals 4 & 5 are

only included on adjustable

units. R

T is used when external

adjustment is ordered.

S1 = Initiate Switch

UTL = Untimed Load (optional)

NO = Normally Open

NC = Normally Closed

C = Common

A knob, or terminals 4 & 5 are

only included on adjustable

units. R

T is used when external

adjustment is ordered.

Wiring Diagram

Ordering Information

MODEL

INPUT VOLTAGE

ADJUST. TIME

DELAY

FUNCTION

HRISW21FT 24 - 240VAC/24 - 110VDC Onboard 0.1 - 10s Alternating

HRISW27I

24 - 240VAC/24 - 110VDC Onboard 0.1 - 10h Interval

HRPSD12HI 12 - 48VDC

Fixed

2h

Interval

HRISW25B

24 - 240VAC/24 - 110VDC Onboard 1 - 100m Delay on

break

If you don’t find the part you need, call us for a custom product 800-843-8848