Time Delay Relays

Part Number	Description / PDF	Quantity
ESDR221A2 Wickmann / Littelfuse	RELAY TIME DELAY SS RECYCLING	0
2697280000 Weidmuller	ON-DELAY TIMING RELAY, NUMBER OF	18167
ATE1-1M-24VDC IndustrialeMart	ON-DELAY MAX 1M 24VDC DPDT(2C)	0
CT1S8 Wickmann / Littelfuse	RELAY TIME DELAY 1 SEC/8SEC CHAS	1
7012AB TE Connectivity Aerospace Defense and Marine	RELAY TIME DELAY 5SEC 10A 240V	6
TS2423 Wickmann / Littelfuse	RELAY TIME DELAY INTERVAL VERSA	0
8286410000 Weidmuller	RELAY TIME DELAY 0.15S 0.02A 48V	0
TDUSH3001A Wickmann / Littelfuse	RELAY TIME DELAY SINGLE SHOT	0
H3BA-N8H DC24V Omron Automation & Safety Services	RELAY TIME DELAY 300HRS 5A 250V	6
15954.2 Conta-Clip	MULTI FUNCTION TIMING RELAY	5
H3DS-ML AC24-230/DC24-48 Omron Automation & Safety Services	RELAY TIME DELAY 120HRS 5A 250V	170
7022AH TE Connectivity Aerospace Defense and Marine	RELAY TIME DELAY 30MIN 10A 240V	5
H3DT-HCL AC100-120V Omron Automation & Safety Services	RELAY TIME DELAY 120SEC DIN RAIL	8
ORM120A25 Wickmann / Littelfuse	RELAY TIME DELAY 300SEC 10A 120V	46
TSS422 Wickmann / Littelfuse	RELAY TIME DELAY SINGLE SHOT TMR	0
2697260000 Weidmuller	CLOCK GENERATOR, NUMBER OF CONTA	1293
FS4E-12/24VDC IndustrialeMart	TIMER MULTI 12-24VDC 8MODE	7
ORB24A11D Wickmann / Littelfuse	RELAY TIME DELAY	8
LT4HW-AC240VS Panasonic	RELAY TIME DELAY 9999HRS 5A 250V	9
83.02.0.240.0000 Finder Relays, Inc.	TIMER RLY DPDT 10A 24V-240VAC/DC	14

Time Delay Relays

1. Overview

Time Delay Relays (TDRs) are control devices that execute switching operations after a predetermined time interval. They integrate timing functions into electrical systems to manage sequence operations, protect equipment, and optimize process efficiency. Modern industrial automation relies on TDRs for precise control in applications ranging from motor startups to complex manufacturing processes.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
On-Delay Relay	Delays contact closure after power application	Motor soft start, conveyor belt synchronization
Off-Delay Relay	Delays contact opening after power removal	Fan cooling systems, oven shutdown sequences
Interval Timer	Controls fixed-duration outputs	Valve actuation, injection molding cycles
Repeat Cycle Timer	Alternates between on/off states	Conveyor indexing, periodic lubrication systems

3. Structure and Components

Typical TDR construction includes:

Enclosure: Flame-retardant polymer housing (IP20-IP67 ratings)
Electromagnetic System: Coil assembly with laminated iron core
Contact Mechanism: Silver alloy contacts (NO/NC configurations)
Timing Circuit: Analog RC circuits or digital microcontrollers
User Interface: Dial/potentiometer or digital display for setting adjustment

4. Key Technical Specifications

Parameter	Typical Range	Importance
Timing Range	0.1s-999h	Determines application flexibility
Accuracy	1% to 10ms	Critical for precision processes
Power Supply	12-240V AC/DC	Matches system voltage requirements
Contact Rating	5-30A resistive	Ensures load compatibility
Ambient Temp. Range	-20 C to +70 C	Operational reliability factor

5. Application Areas

Primary industries include:

Manufacturing: Press machine sequence control
Energy: Transformer cooling systems
Building Automation: HVAC fan delay control
Process Industry: Pump alternation systems
Transportation: Railway signal timing

Typical equipment integration: CNC machines, packaging lines, water treatment systems.

6. Leading Manufacturers and Products

Manufacturer	Key Product Series	Distinguishing Features
Siemens	3RP25/3RP15 series	DIN rail mounting, LED status display
Omron	H3CR-A/-M models	Multi-voltage capability, compact design
Schneider Electric	Tesys T-ModTime series	Modbus communication, 12 timing functions
AutomationDirect	DL-TDR series	Programmable via USB interface

7. Selection Recommendations

Key considerations:

Timing function type (ON/OFF delay, interval, etc.)
Environmental conditions (temperature, vibration)
Electrical requirements (voltage/frequency compatibility)
Mounting method (DIN rail, panel mount, socket mounting)
Agency approvals (CE, UL, CSA standards)

Case Study: A bottling plant successfully implemented Omron H3CR-M timers for conveyor synchronization, achieving 15% throughput improvement.

8. Industry Trends

Emerging developments include:

Integration with Industrial IoT (remote monitoring via Ethernet/IP)
Adoption of solid-state relay technology (SSR) for higher switching speeds
Energy-efficient designs meeting Ecodesign Directive 2019/1782
AI-enhanced predictive timing adjustment in smart manufacturing