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R Type Overloads

Interchangeable Heater Thermal Overload Relays

A highly versatile thermal overload relay in a single frame size employing interchangeable heater packs to provide protection upto 72A (FLC) direct connected or 832A (FLC) using a current transformer.

Designed to comply with IEC947, BE EN 60947, IEC 292 and BS4941

  • Phase Loss Trip
  • Ambient Temp. Compensation -400C to +700C
  • Electrically Separate Trip Contacts
    (Hand Reset Version)
  • Hand Reset (Auto Available on Request)
  • Interchangeable Heaters
  • Direct & CT Operation
  • Trip Indication
  • DOL & Star/Delta Calibration
  • Small Panel Projection

 

Rated Insulation Voltage :
Frequency Limits (operating current) :
Ambient Temperature Storage Limits :
Trip Switch—Rated Thermal Current :
Trip Switch—Rated Thermal Current :

 

660V
40-400Hz
-400C to +800C
10A Ith (Hand Reset)
4A Ith (Auto & Alarm)


Auxiliary Contact Rating

AC15 to IEC947

Hand

Auto/Alarm

650V 0.5A 650V 0.15A
440V 1.0A 440V 0.25A
250V 2.0A 250V 0.50A
110V 4.0A 110V 1.00A
Wiring Diagram Time / Current Curves
 
  The time/current curves shown above are typical curves and are derived from an average of the individual heater performance curves.
FLC (A)  Configuration  Diagram No. Approx Trip Times @ 6 x FLC
 Line Connected  Phase Connected  From Cold    From Hot  
 0.21-72.0    7.1 - 124    Direct Connected    1    22 Secs.    15 Secs.  
 61 - 832    105 - 1439    Relay & CT Type CTR/CTB  2    29 Secs.    14 Secs.  

Cabling & Terminals

The standard unit has 6 main terminals rated up to 27A, they are suitable for cable up to 6mm2 . For ratings between 27A and 72A, platform terminals are suitable for cables up to 25mm2. Alternatively, for the latter ratings, loop terminals are available with a maximum cable capacity of 35mm2.

Auxiliary contact terminals will accept cables up to the equivalent of two 2.5mm2.

Order separately—R-Type Overload with Terminals + Heater Pack

Overload Relay with Terminals
Current Range (A) Type  Trip Contact    Terminals    Ordering Code  
0.21-27.0  Hand, Stop Only    N/O & N/C    Saddle Clamp    OLRRS  
 Hand, Start & Stop    N/O & N/C    Saddle Clamp    OLRMS  
 Auto    Changeover    Saddle Clamp    OLRAS  
27 - 72  Hand, Stop Only    N/O & N/C    Platform    OLRRP  
 Hand, Stop Only    N/O & N/C    Loop    OLRRL  
 Hand, Stop Only    N/O & N/C    3 Loop, 3 Platform    OLRRM  
 Hand, Start & Stop    N/O & N/C    Platform    OLRMP  
 Hand, Start & Stop    N/O & N/C    Loop    OLRML  
 Hand, Start & Stop    N/O & N/C    3 Loop, 3 Platform    OLRMM  
 Auto    Changeover    Platform    OLRAP  
 Auto    Changeover    Loop    OLRAL  
 Auto    Changeover    3 Loop, 3 Platform    OLRAM  

 

Solenoid Reset Assembly
 50Hz    60Hz    Ordering Code  
 12-24V      U-4145112  
 32-50V      U-4145113  
 55-92V    110-120V    U-4145114  
 110-127V      U-4145115  
 160-346V    200-380V    U-4145116  
 380-550V    400-600V    U-4145117  

 

Heater Packs

Comprises three heaters with Full Load Current calibration labels.
All heater packs have WHITE labels showing calibration for line connected relays (DOL, Auto Transformer & Stator Rotor). Heaters (Ref. YA to SE) also include YELLOW labels giving calibration in terms of motor FLC for use with phase connected relays (Star/Delta).

 Heater Packs (3 Per Set) 
Motor FLC (A) Line Connected
Max Fuse (A) *
Ordering Code
Motor FLC (A) Line Connected
Motor FLC (A) Phase Connected Star/Delta Starter
Max Fuse (A) * Std.
Max Fuse (A) * Motor
Ordering Code
0.21 - 0.25
2
OLRHA
4.1 - 4.9
7.1 - 8.5
16
 
 OLRHYA  
0.25 - 0.29
2
OLRHB
4.8 - 5.8
8.5 - 10.0
20
 
 OLRHYB  
0.29 - 0.35
2
OLRHC
5.9 - 7.1
10.0 - 12.0
20
 
 OLRHYC  
0.32 - 0.38
2
OLRHD
7.0 - 8.4
12.0 - 14.5
25
20M25
 OLRHYD  
0.37 - 0.45
2
OLRHF
8.4 - 10.0
14.5 - 17.5
32
20M32
 OLRHYE  
0.44 - 0.53
2
OLRHH
10.0 - 12.0
17.5 - 21.0
35
32M35
 OLRHZF  
0.50 - 0.60
2
OLRHJ
12.0 - 14.5
21.0 - 25.0
35
32M35
 OLRHZG  
0.57 - 0.69
2
OLRHK
14.5 - 17.5
24.5 - 29.5
40
32M40
 OLRHZH  
0.67 - 0.80
4
OLRHL
17.0 - 20.5
29.0 - 35.0
50
32M50
 OLRHZJ  
0.74 - 0.88
4
OLRHM
19.5 - 23.0
33.5 - 40.0
63
32M63
 OLRHZK  
0.84 - 1.00
4
OLRHN
22.5 - 27.0
39.0 - 47.0
63
32M63
 OLRHZL  
1.00 - 1.20
6
OLRHO
27.0 - 32.0
46.0 - 56.0
80
63M80
 OLRHSA  
1.20 - 1.40
6
OLRHP
33.0 - 40.0
57.0 - 69.0
80
63M80
 OLRHSB  
1.50 - 1.80
10
OLRHR
41.0 - 49.0
71.0 - 85.0
100
63M100
 OLRHSC  
1.80 - 2.20
10
OLRHXP
50.0– 60.0
86.0– 104.0
125
100M160
 OLRHSD  
2.10 - 2.50
10
OLRHXR
60.0 - 72.0
104.0 - 124.0
160
100M160
 OLRHSE  
2.50 - 3.00
16
OLRHXS
3.00 - 3.60
16
OLRHXT
3.60 - 4.30
16
OLRHXU

Maximum fuse for short circuit protection, prospective 50KA, Type 2 IEC 947, BS EN 60947. These are maximum values and not necessarily values for a particular FLC, therefore the following should be adopted :

1. Select fuse for a particular FLC from manufacturers catalogue.
2. If not greater than listed maximum values then overload is satisfactorily protected.

2

  • Fully encapsulated CTs
  • CTs to BS 7626 Class IOP 3.5 2.5VA
  • Long Lag CTs to BS 7626 Class IOP 1.4 2.5VA
Ordering Information—Current Transformers  
Motor FLC (A) Line Connected Motor FLC (A) Phase Connected Overload Heater Ref.  3 Phase CT Ref.    1 Phase CT Ref    Turns Ratio  
 61-73    105-126    OLRHYA

CTR010015A Supplied with 3 holes for primary cables

CTB010015A Supplied with 3 bar primary connections

CTR01001SS Supplied with 1 hole for primary cable  

 1 : 15  
 72-87    124-150    OLRHYB
 88-106    152-183    OLRHYC
 106-126    183-218    OLRHYD
 126-150    218-259    OLRHYE
 150-180    259-311    OLRHZF
 143-171    240-295    OLRHYA CTB010035A Supplied with 3 bar primary connections      1 : 35  
 168-203    290-351    OLRHYB
 206-248    356-429    OLRHYC
 245-294    424-508    OLRHYD
 294-350    508-605    OLRHYE
 350-420    605-726    OLRHZF
 345-402    597-695    OLRHYB CTB010065A Supplied with 3 bar primary connections      1 : 65  
 402-480    695-830    OLRHYC
 480-546    830-944    OLRHYD
 546-692    944-1197  OLRHYE
 692-832    1197-1439  OLRHZF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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