Ensure that the ambient temperature is within the "operating temperature range" specified in the catalog. Use of the relay at a temperature outside this range may adversely affect insulation or contact performance. For the relationship between the ambient temperature and relay drive conditions, refer to 3. NOTES ON DRIVING RELAYS.
 

Use of a sealed type relay in a high humidity (RH85% or higher) environment for a long time may introduce moisture inside the relay. This moisture may combine with NOx or SOx generated by glow discharges to produce nitric acid or sulfuric acid. In this case, the acid produced may corrode the metal that forms the relay, causing operation troubles. If use of the relay in such a high humidity environment is unavoidable, consult World Products in advance.
 

Use of a relay in an atmosphere with a high concentration of sulfur gases (H₂S, SO2), nitric acid gas (HNO3), ammonia (NH3), silicon vaporization gas, etc., may cause functional troubles. Avoid use of the relay in such an atmosphere. If it is unavoidable, use a sealed type relay.
 

A sealed type relay maintains constant sealability under normal pressures (810 to 1200 hpa). Other pressure conditions may destroy its sealability or cause deformation, causing functional trouble. Be sure to use the relay under normal pressure conditions.
 

The vibration resistance and shock resistance of a relay are as shown in the catalog and use of the relay under conditions other than those specified may cause malfunctions or damage.

Be sure to use the relay within published vibration and shock specifications.

Before the relay is used, repeated, excessive, vibration or shock may cause the relay to malfunction by causing metal deposition on the contacts and other functional problems. Malfunctions due to vibration or shock during operation may cause considerable damage or wear to the contacts.

Note that operation of a snap switch mounted close to the relay or the shock associated with the operation of an electromagnet may cause malfunctioning.
 

The magnetic circuit of an NEC Miniature Signal Relay is constructed so that the relay does not easily malfunction due to the influence of external magnetic fields. However, under the influence of magnetic flux leaking from a transformer, speaker, or magnet placed in the vicinity of the relay, the must operate voltage, must release voltage, operate time, release time and other dynamic characteristics may change.

In applications where a change in these characteristics poses problems, it is necessary to take measures such as magnetic shielding. The magnetic flux leaking from relays that are densely located may cause them to interfere with each other. Fig. 9 shows examples of the mounting, magnetization, and change in the must operate voltage of signal relays in the EA2 series. In applications where these characteristics changes pose a problem, it is necessary to reduce the mounting density.