Eaton
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Series-C Frame Size - M Part Index CLICK HERE |
Type HMDL (3-Pole) Shown |
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MDL3450 Thermal-Magnetic Circuit Breakers with Interchangeable Trip Units
| Number of Poles |
Amperes | Interrupting Capacity |
Type of Trip |
Terminals |
|---|---|---|---|---|
| 3 | 450 | Standard 600 Vac Rated 50 kAIC at 480 Vac |
Adjustable Thermal-Magnetic |
Standard |
Quick Reference Guide
| UL 489/CSA Interrupting Capacity Ratings(1) | |||||
| Circuit Breaker Type |
Number of Poles |
Interrupting Capacity (kA Symmetrical Amperes) | |||
|---|---|---|---|---|---|
| Volts AC (50/60 Hz) | Volts DC(2)(3) | ||||
| 240 | 480 | 600 | 250 | ||
| MDL, MDLB | 2, 3 | 65 | 50 | 25 | 22 |
| CMDL | 2, 3 | 65 | 50 | 25 | — |
| HMDL, HMDLB | 2, 3 | 100 | 65 | 35 | 25 |
| CHMDL | 2, 3 | 100 | 65 | 35 | — |
| IEC 947-2 Interrupting Capacity Ratings 1 | |||||
| Circuit Breaker Type |
Number of Poles |
Interrupting Capacity rms (kA Symmetrical Amperes) ICU ≠ ICS | |||
|---|---|---|---|---|---|
| Volts AC (50/60 Hz) | Volts DC(2)(3) | ||||
| 240 | 415 | 690 | 250 | ||
| MDL, MDLB | 2, 3 | 65/65 | 50/50 | 20/10 | 20/10 |
| CMDL | 2, 3 | 65/65 | 50/50 | 20/10 | — |
| HMDL, HMDLB | 2, 3 | 100/100 | 70/50 | 25/13 | 20/10 |
| CHMDL | 2, 3 | 100/100 | 70/50 | 25/13 | — |
NOTES:
(1) Utilization Category A circuit breakers.
(2) Two-pole or two poles of three-pole circuit breaker. Thermal-magnetic trip units only, MDL, HMDL breakers with electronic trip unit are not DC rated.
(3) Time constant is 3 milliseconds minimum at 10 kA and 8 milliseconds at 22 kA.
Specifications
| Trip Unit Type | Digitrip RMS 310 | |
| rms sensing | Yes | Yes |
| Breaker Type | ||
| Frame | MDL, MDLB, CMDL, HMDL, HMDLB, CHMDL | MDL, MDLB, CMDL, HMDL, HMDLB, CHMDL |
| Ampere range | 400–800A | 400–800A |
| Interrupting rating at 480 volts |
50, 65 (kA) | 50, 65 (kA) |
| Protection | ||
| Ordering options | LS, LSG | LSI, LSIG |
| Fixed rated plug (In) |
Yes | Yes |
| Overtemperature trip | Yes | Yes |
| Long Delay Protection (L) | ||
| Adjustable rating plug (In) |
Yes | Yes |
| Long delay pickup | 0.5–1.0 (In)(1) | 0.5–1.0 (In)(1) |
| Long delay time I2t | 12 seconds | 12 seconds |
| Long delay time I4t | No | No |
| Long delay thermal memory |
Yes | Yes |
| High load alarm | No | No |
| Short Delay Protection (S) | ||
| Short delay pickup | 200–800% x (In) | 200–800% x (In) |
| Short delay time I2t | 100 ms | No |
| Short delay time flat | No | Inst–300 ms |
| Short delay time zone selective interlocking |
No | No |
| Instantaneous Protection (I) | ||
| Instantaneous pickup | No | 200–800% x (In) |
| Discriminator | No | No |
| Instantaneous override | Yes | Yes |
| Ground Fault Protection (G) | ||
| Ground fault alarm | No | No |
| Ground fault pickup | 1–5 x Ig (160A) | 1–5 x Ig (160A) |
| Ground fault delay I2t | No | No |
| Ground fault delay flat | Inst–500 ms | Inst–500 ms |
| Ground fault zone selective interlocking |
No | No |
| Ground fault thermal memory |
Yes | Yes |
| System Diagnostics | ||
| Status LEDs | Yes | Yes |
| Cause of trip LEDs | No | No |
| Magnitude of trip information | No | No |
| Remote signal contacts—ground alarm |
Yes(2) | Yes(2) |
| System Monitoring | ||
| Digital display | No | No |
| Current | No | No |
| Power and energy | No | No |
| Power quality— harmonics |
No | No |
| Power factor | No | No |
| Communications | ||
| Eaton’s PowerNet | No | No |
| Testing | ||
| Testing method | Test set | Test set |
| Legend In = Rating Plug |
Notes (1) Adjust by rating plug. (2) With separate ground fault alarm unit (GFAU). |
MDL3450 Dimensions
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| Number of Poles | Width | Height | Depth |
|---|---|---|---|
| 2, 3 | 8.25 (209.6) | 16.00 (406.4) | 4.06 (103.1) |