R Type Overloads |
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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
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Rated Insulation Voltage :
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660V
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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 | |
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| 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
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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 |
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3.00 - 3.60 |
16 |
OLRHXT |
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3.60 - 4.30 |
16 |
OLRHXU |
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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.
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| 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 | |||
