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Difference between Polarized and Non-polarized Relays

1．Difference between Polarized and Non-polarized Relays

	Polarized	Non-polarized
Main relays	DS-P, DK, ST	LK-Q, JS, LQ
Contact arrangement	1a, 1b, 1c, 2a, 2b, 2c, 1a1b, 4a, 4c, 2a2b, 3a1b	1a, 1c, 2a, 2c
Latching type	With	Without
Nominal operating power (Comparison: 10A type)	DK relays 200mW	JS relays 360mW
Vibration and shock resistance	Strong compared to non-polarized relays.	Weak compared to polarized relays.

2．Features of polarized power relay

1.Latching type

Coil power consumption can be controlled, because ON or OFF state of relay contact can be held using pulse input (zero power consumption when there is no pulse drive).

Non-polarized (non-latching) type

Polarized (latching) type

Current flows endlessly through coil

Power saving realized with pulse drive

2.High sensitivity

When compared under the same contact capacity, the polarized relays are more sensitive than non-polarized relays.

Compared with 10 A switching capacity	DK relays 200mW
Compared with 10 A switching capacity	JS relays 360mW

3.Superior vibration resistance

Vibration resistance (Functional)	DK relays 10 to 55Hz (double amplitude of 3mm)
Vibration resistance (Functional)	JS relays 10 to 55Hz (double amplitude of 2mm)

4.Superior NC (b contact) switching ability

Contact bouncing when resetting is controlled thanks to power of permanent magnet.
NC switching ability at same level as NO (a contact) is maintained.