Time Delay Relays

Part Number	Description / PDF	Quantity
AT8N-1 IndustrialeMart	TIMER 100H 12VDC DPDT/SPDT	109
ATS8W-11 IndustrialeMart	TWIN TIMER 10H 12VDC 8PIN	34
ATS11-21E IndustrialeMart	TIMER 10H 2SPDT 24VAC/DC	0
ATE-10M IndustrialeMart	ON-DELAY MAX 10M 110/220VAC	0
ATE-6S IndustrialeMart	ON-DELAY MAX 6S 110/220VAC	120
ATE1-60M-110VAC IndustrialeMart	ON-DELAY MAX 60M 110VAC DPDT(2C)	0
TTM4030M-110VAC IndustrialeMart	MINI TIMER 30M 4PDT 110VAC	5
AT11EN-1 IndustrialeMart	TIMER 100H 12VDC 2SPDT	83
ATE1-10S-110VAC IndustrialeMart	ON-DELAY MAX 10S 110VAC DPDT(2C)	0
AT8PSN-2 IndustrialeMart	OFF-DELAY 0.05-10S 24VAC/DC	0
LE3S-24-240 IndustrialeMart	TIMER 10H SPDT 24-240V 8PIN	77
TTM4010S-110VAC IndustrialeMart	MINI TIMER 10S 4PDT 110VAC	6
TTM4010S-220VAC IndustrialeMart	MINI TIMER 10S 4PDT 220VAC	10
ATE1-60S-24VDC IndustrialeMart	ON-DELAY MAX 60S 24VDC DPDT(2C)	10
FS4E-1P4 IndustrialeMart	TIMER MULTI 24VAC 100-240VAC	14
FS5E-I4 IndustrialeMart	TIMER INDICATOR 100-240VAC	2
ATS8-23 IndustrialeMart	TIMER 30H DPDT(2C)/2SPDT 24VACDC	0
ATS8-43 IndustrialeMart	TIMER 30H DPDT(2C)/2SPDT 24-240V	0
LE365S-41 IndustrialeMart	WEAKLY TIMER SPDT 100-240VAC	63
ATE1-3H-110VAC IndustrialeMart	ON-DELAY MAX 3H 110VAC DPDT(2C)	0

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