821TD10H-UNI Magnecraft / Schneider Electric, 821TD10H-UNI Datasheet

Time Delay & Timing Relays 12-240VAC/VDC 17.5MM

821TD10H-UNI

Manufacturer Part Number

821TD10H-UNI

Description

Time Delay & Timing Relays 12-240VAC/VDC 17.5MM

Manufacturer

Magnecraft / Schneider Electric

Datasheet

1.821TD10H-UNI.pdf (6 pages)

Specifications of 821TD10H-UNI

Contact Form

SPDT

Contact Rating

15 A

Contact Configuration

SPDT

Nom Input Voltage

240V

Delay Time Range

0.1s To 10day

Relay Mounting

DIN Rail

Contact Current Ac Max

15A

Height

88.9mm

Mounting Type

DIN Rail

Brand/series

820 Series

Current, Rating

15 A

Display Type

LED

Function

Timing

Material, Contact

Silver-Nickel 90⁄10

Relay Type

Electro Mechanical

Standards

UL, CE, RoHS

Temperature, Operating, Maximum

55 °C

Temperature, Operating, Minimum

-20 °C

Timer Type

Single Shot

Timing Range

0.1 sec. to 10 Days

Voltage, Control

240 VAC⁄VDC

Voltage, Rating

240⁄24 VAC⁄VDC

Ten Time Scales

0.1 Seconds to 10 days

Timing Adjustment

Screwdriver Slot

Rohs Compliant

Yes

Accuracy

0.2 %

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Lead free / RoHS Compliant

Current page: 1 of 6
Download datasheet (478Kb)

Time Delay Relays – Application Data

Definition:

Time Delay is defined as the controlled period between the functioning of two events. A Time Delay relay is a combination

of an electromechanical output relay and a control circuit. The control circuit is comprised of solid state components and

timing circuits that control operation of the relay and timing range. Typical time delay functions include On-Delay, Repeat

cycle (starting off), Interval, Off-Delay, Retriggerable One Shot, Repeat cycle (starting on), Pulse Generator, One Shot,

On/Off Delay, and Memory Latch. Each function is explained in the table below. Time delay relays have a broad

choice of timing ranges from less than one second to many days. There are many choices of timing adjustments from

calibrated external knobs, DIP switches, thumbwheel switches, or recessed potentiometer. The output contacts on the

electromechanical output relay are direct wired to the output terminals. The contact load ratings are specified for each

specific type of time delay relay.

Understanding the differences between all the functions available in time delay relays can sometimes be a daunting task.

When designing circuits using time delay relays questions such as:

“What initiates a time delay relay?”

“Does the timing start with the application or release of voltage?”

“When does the output relay come on?”

must be asked.

Time delay relays are simply control relays with a time delay built in. Their purpose is to control an event based on time.

The difference between relays and time delay relays is when the output contacts open & close: on a control relay, it

happens when voltage is applied and removed from the coil; on time delay relays, the contacts will open or close before

or after a pre-selected, timed interval.

Typically, time delay relays are initiated or triggered by one of two methods:

• application of input voltage (On Delay, Interval On, Flasher, Repeat Cycle, Delayed Interval & Interval/Flasher).

• opening or closing of a trigger signal (Off Delay, Single Shot & Watchdog).

These trigger signals can be one of two designs:

• a control switch (dry contact), i.e., limit switch, push button, float switch, etc.

• voltage (commonly known as a power trigger).

To help understand, some definitions are important:

Input Voltage: Control voltage applied to the input terminals (see wiring diagrams below). Depending on the function,

input voltage will either initiate the unit or make it ready to initiate when a trigger signal is applied.

Trigger Signal: On certain timing functions, a trigger signal is used to initiate the unit after input voltage has been applied.

As noted above, this trigger signal can either be a control switch (dry contact switch) or a power trigger (voltage).

Output (Load): Every time delay relay has an internal relay (usually mechanical) with contacts that open & close to control

the load. They are represented by the dotted lines in the wiring diagrams. Note that the user must provide the voltage to

power the load being switched by the output contacts of the time delay relay.

The following tables contain both written and visual descriptions on how the common timing functions operate. A Timing

Chart shows the relationship between Input Voltage, Trigger Signal (if present) and Output Contacts.

5/2

M agne cr aft S olu tion Guide 1 0 5 A

Related parts for 821TD10H-UNI

821TD10H-UNI Summary of contents

Page 1

... Time delay relays are simply control relays with a time delay built in. Their purpose is to control an event based on time. The difference between relays and time delay relays is when the output contacts open & close control relay, it happens when voltage is applied and removed from the coil ...

Page 2

... REPEAT CYCLE and time delay t begins. When time delay t is complete, contacts return to Starting On their shelf state for time delay t. This cycle will repeat until input voltage U is removed. Trigger switch is not used in this function. G. Upon application of input voltage U, a single output pulse of 0.5 seconds is PULSE delivered to relay after time delay t ...

Page 3

... Advantages of the 820 Series Time Delay Relays Input Indication Green LED Light. Input Terminals Accepts AWG Wire. 5/4 Output Indication Red LED Light. Time Setting Select Between 10 Different Time Scales. DIN Rail Mounting Mounts Directly On a DIN Rail. Fine Time Setting Ultimate Control in Accuracy ...

Page 4

... The new 820 Series Time Delay Relays are DIN rail mountable products offering 10 different timing functions, 2 status LEDs, ultra-wide timing range (0.1 sec to 10 days) and a universal voltage input (12-240 VAC/VDC) all in one modular package. The 821 is available amp SPDT timer while its counterpart 822 is available as a DPDT timer also capable of switching amps per pole ...

Page 5

... V AWG (mm2 (Nm) °C °C grams Time Setting Fine Time Setting Function Output Terminals DPDT (822 Version Only) Output Terminals DIN Mount 821TD10H-UNI 822TD10H-UNI SPDT Silver Alloy 15 240 AC, 50/60 Hz 240 AC, 50/ 1/2 @ 120VAC 1/2 @ 120VAC 1 @ 240 VAC 1 @ 240 VAC B300 100 Red 12… ...

Page 6

... See Section 3 p.18 Rated Load Current SPDT 15 Amps DPDT 15 Amps – Input Voltage UNI = 12...240 VAC/VDC 0.6 (14.2) INPUT VOLTAGE VOLTAGE EXTERNAL CONTROL 0.7 SWITCH (16.71 INPUT VOLTAGE 821TD10H-UNI 822TD10H-UNI COMMON 16 - NORMALLY CLOSED NORMALLY OPEN COMMON 26 - NORMALLY CLOSED NORMALLY OPEN 822TD10H-UNI INPUT 5/7 ...

Related keywords

821TD10H-UNI datasheet
821TD10H-UNI data sheet
821TD10H-UNI pdf datasheet
821TD10H-UNI component
821TD10H-UNI part
821TD10H-UNI distributor
821TD10H-UNI RoHS
821TD10H-UNI datasheet download