Panasonic ASCT1F46E Category, Section, Automotive Relay User’s GuidePanasonic Electric Works

Please use the check sheet.

	Category		Section
1.	Confirmation	1.	Confirmation
	under the		under the
	actual use		actual use
	condition
2.	Safety	1.	Specification
	precautions		range
		2.	Installation,
			maintenance
		3.	Connection
		4.	Fail-safe
3.	Selection of	1.	Selection
	relay type

Automotive Relay User’s GuidePanasonic Electric Works

Obihiro Co., Ltd.

Oct. 1, 2008: 1st Edition

1

Contents

The rated switching power and life mentioned in the specification and catalog are given only as guides. A relay may encounter a variety of ambient conditions during actual use resulting in unexpected failure. Therefore, it is necessary for proper use of the relay to test and review with actual load and actual application under actual operating conditions.

Use that exceeds the specification ranges such as the coil rating, contact rating and switching life should be absolutely avoided. Doing so may lead to abnormal heating, smoke, and fire.

Never touch live parts when power is applied to the relay. Doing so may cause electrical shock. When installing, maintaining, or troubleshooting a relay (including connecting parts such as terminals and sockets), be sure that the power is turned off.

When connecting terminals, please follow the internal connection diagrams in the catalog to ensure that connections are done correctly. Be warned that an incorrect connection may lead to unexpected operation error, abnormal heating, and fire.

If there is a possibility that adhesion, contact failure, or breaking of wire could endanger assets or human life, please make sure that a fail-safe system is equipped in the vehicle.

In order to use the relays properly, the characteristics of the selected relay should be well known, and the conditions of use of the relay should be investigated to determine whether they are matched to the environmental conditions, and at the same time, the coil specification, contact specification, and the ambient conditions for the relay that is actually used must be fully understood in advance.

In the table below, please refer to a summary of the consideration points regarding selection of relay.

	Items	Consideration points regarding selection
		- Select relay with consideration for power source ripple.
	a) Rating
	b) Pull-in voltage	- Give sufficient consideration to ambient temperature
	(current)	and for the coil temperature rise, and hot start.
	c) Drop-out voltage	- When used in conjunction with semiconductors, careful
Coil	(current)	with the voltage drop.
	d) Maximum continuous	- When starting up, careful with the voltage drop.
	impressed voltage
	(current)
	e) Coil resistance
	f ) Temperature rise
		- Note that the relay life is balanced with the life of the
		device the relay is used in.
	a) Contact arrangement	- Is the contact material matched to the type of load? It is
	b) Contact rating	necessary to take care particularly with low level usage.
Contact	c) Contact material	- The rated life may become reduced when used at high
	d) Life	temperatures. Life should be verified in the actual use
	e) Contact resistance	atmosphere.
		- It is necessary to be tested and reviewed under actual
		use conditions with actual load and actual application.
		- Note that ambient temperature and applied voltage
	a) Operate time	cause the change of operate time and bounce time.
Operate time	b) Release time	- Note that operate time and release time do not include
	c) Bounce time	bounce time.
	d) Switching frequency	- Give consideration that switching life changes
		depending on switching frequency.
	a) Vibration resistance	- Give consideration to performance under vibration and
Mechanical	b) Shock resistance	shock in the use location.
	c) Ambient use	- Confirm the allowable ambient temperature of the relay.
characteristics
	temperature
	d) Life
		- Selection can be made for connection method with
	a) Breakdown voltage	plug-in type, printed circuit board type, soldering, and
	b) Mounting,	screw fastening type.
Other items	Connection	- Selection of protection construction can be made for
	c) Size	PCB mounting method such as soldering and cleaning.
	d) Protection	- For use in an adverse atmosphere, sealed construction
	construction	type should be selected.
		- Are there any special conditions?