S3RU Series thermal overload relay

Quick Details

• Place of Origin: Zhejiang, China (Mainland)
• Brand Name: suntree/OEM
• Model Number: 3RU
• Theory: Thermal Relay
• Usage: Protective
• Size: Miniature
• Protect Feature: Sealed
• Contact Load: Low Power
• rated insulation voltage: 660V
• rated current: 12.5A-630A
• type: 3UA/LR1/LR2/T/JR20/JR36
• STANDARD: IEC60947-4
• Price: Competitive
• quality: Stable and reliable
• class: A,B
• Certification: CE,ISO9001
• PHASE: 3
• PROTECT FEATURE: SEALED

Application

S3RU series thermal overload relay are suitable for overload and
phase-failure protection of AC motors with frequency of 50/60Hz,
voltage up to 690V, current up to 0.1-100A under 8-hours duty or
uninterrupted duty.
Several functions provided by these relays, are phase-failure
protection, temperature compensation, ON/OFF indication, Stop
button ,Test button and manual/automatic reset.
Applicable Standards：National Standard：GB14048. International
Standards：IEC609474-1 The relays can be mounted onto contactors
or installed as single units.

Operating conditions

• The altitude couldn't exceed 2000m;
• Ambient temperature：-5℃ ~+55℃ and the average temperature no more than +35℃ in 24 hours;
• Atmosphere：Comparative humidity no more than 50% at max +40℃ , and it may be higher at a lower temperature. The lowest average temperature no more than+20℃ in the wettest month. The maximum average comparative humidity of this month couldn't exceed 90%，The change of temperature leading to dew on the product must be considered;
• Class of pollution：Class 3;
• The slope between installation surface and vertical surface couldn't exceed ±5°;
• Keeping away from explosive, corrosive and electric atomy;
• Keeping dry;
• The product should be used and installed at certain place without any shock, vibration etc.

Features

• Three-phase thermal relays with release class 10A;
• With differential phase-failure protection;
• With continuous current adjusting scale;
• With temperature compensation;
• With ON/OFF indicator;
• With TEST (OFF) button;
• With Manual/Auto reset button;
• With Auxiliary contacts 1NO+1NC insulated each other;
• Mounting：plug in connection with contactor or install as a single unit.

Protection characteristics