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Phase Unbalance Current Monitoring Relay Integrative Structure For Compressors
♦ Features
-- Integrative structure
-- Three-phase monitoring of overload, phase loss, phase unbalance
-- Powered by the measuring circuit
-- 1 NC SCR output contact
-- 4 LEDs for status indication
♦ Protective Functions
-- Overload
-- Phase loss
-- Phase unbalance
♦ Typical Applications
• Pumps • Fans
• Blowers • Motors
• Compressors
♦ Approvals
• CE • CCC
Normal operating conditions and installation conditions
1, the ambient temperature: -25 °C ~ +65 °C.
2, the working frequency: 45 ~ 60Hz.
3, working voltage: 24V ~ 380V.
4, the output interface load capacity: AC380V 1A, COSΦ = 0.3 ~ 0.4.
5, installation size: in line with JR16 thermal relay standards.
6, installation location: any angle of installation and protection
class IP40.
The protector adopts the core-type current sampling detection technology, thyristor output, simple structure, convenient use, reliable operation, and has the advantages of no power consumption, long life, no arc generation during operation, etc. It is the ideal replacement for thermal relay in China. Motor protection products
The main cause of overload is the improper selection of the
conductor cross-section, and the actual load has exceeded the
safety current of the conductor.
Too many high-power devices are connected to the line, which
exceeds the load capacity of the distribution line.
Lighting lines in important material warehouses, residences, and
public buildings may have power lines that may cause long-term
overloading of wires or cables, and when insulated conductors with
a burn-proof jacket are used for laying on flammable or
hard-to-burn building components. , should take overload
protection. Line overload protection should adopt automatic switch.
During operation, the setting current of the automatic switching
long-delay operation should not exceed the long-term allowable load
current of the line. If a fuse is used for overload protection, the
rated current of the fuse melt shall not be greater than the
long-term load current of the line. When the automatic switch is
used as the protection device, its current release should be
installed on the phase line in the neutral three-phase four-wire
system; in the neutral three-phase four-wire system, It is allowed
to be installed on two phases; ungrounded two-phase two-wire system
allows installation on one phase.
In a communication power system, the function of automatically
disconnecting the power supply due to a large load is called
overload protection.
♦ Technical data
Type | JDB-1 |
Current range | 2.5-5A,4-10A,8-20A,16-40A,32-80A, 63-160A,150-300A |
Startup delay | 5s,10s,20s |
Protective functions | overload,phase loss,phase unbalance |
Setting method | by knob |
Indicators | ABC overload&phase loss |
Output contacts | 1NC(SCR output) |
Contact capacity | 1A 380VAC |
Operating voltage of control loop | AC220V or AC380V |
Dimensions(H*W*D) | 2.5-40A:38*90*63mm 80-300A:44.5*123*67mm |
Mounting | screw fixing |