Product Description
LS Electric MC-22B Metasol Contactor — 22A, 3-Pole, 15 HP @ 460V
The LS Electric MC-22B is a 22A, 3-pole IEC contactor from the Metasol MC B-series. Rated at 15 HP at 460V three-phase (22A AC-3 / 40A AC-1), the MC-22B includes 1 Normally Open (NO) + 1 Normally Closed (NC) built-in auxiliary contact as one side-mounted block. It mounts on 35mm DIN rail or panel backplate and uses screw clamp terminals. LS Electric recommends the MC-22B as the direct replacement for the obsolete GMC-22 series. The compatible overload relay is the MT-32 series (40AF frame), which mounts directly to the contactor load terminals. Choose your coil voltage using the variant selector above.
Quick Specifications
- Current Rating: 22A AC-3 / 40A AC-1
- HP Rating: 10 HP @ 230V / 15 HP @ 460V / 20 HP @ 575V (three-phase)
- Poles: 3-pole, non-reversing
- Coil Voltage: Selected by suffix — see table below
- Aux Contacts (built-in): 1 NO + 1 NC (single side-mounted block)
- Terminal Type: Screw clamp, power and control
- Wire Range: 18–10 AWG, 2 conductor maximum
- Mounting: 35mm DIN rail or screw panel mount
- Operating Rate: Up to 1,800 cycles/hour (AC-3)
- Mechanical Durability: 15,000,000 operations
- Electrical Durability: 2,500,000 operations
- Rated Insulation Voltage Ui: 690V; Uimp: 6 kV
- Compatible Overload: MT-32 series (40AF frame, 0.1–32A range)
- Replaces: LS Electric GMC-22 series (obsolete)
- Weight: 0.8 lbs
- Certifications: UL508 (File E108780/E206826), CE, RoHS
MC-22B Coil Voltage Variants
| Part Number | Coil Voltage | Coil Type |
|---|---|---|
| MC-22B-AC24 | 24V AC, 50/60 Hz | AC |
| MC-22B-DC24 | 24V DC | DC |
| MC-22B-AC120 | 120V AC, 60 Hz | AC — Most Common US |
| MC-22B-AC208 | 208V AC, 60 Hz | AC |
| MC-22B-AC230 | 230V AC, 50/60 Hz | AC |
| MC-22B-AC240 | 240V AC, 60 Hz | AC |
| MC-22B-AC480 | 480V AC, 60 Hz | AC |
Not sure which coil voltage to order? Call Kent Electrical Supply at 1-800-222-5129 or text your RFQ to 484-425-0652.
HP Ratings by Voltage
| Supply Voltage | HP Rating | Phase |
|---|---|---|
| 115V AC | 2 HP | Single-phase |
| 230V AC | 3 HP | Single-phase |
| 200V AC | 7.5 HP | Three-phase |
| 230V AC | 10 HP | Three-phase |
| 460V AC | 15 HP | Three-phase |
| 575V AC | 20 HP | Three-phase |
MC B-Series vs. MC A-Series — Key Differences
The LS Electric MC series splits into two frame families at the 32A threshold. Knowing which family your application requires avoids ordering the wrong aux contact configuration.
| Feature | B-Series (MC-9B to MC-22B) | A-Series (MC-32A and above) |
|---|---|---|
| Aux Contacts (built-in) | 1 NO + 1 NC | 2 NO + 2 NC |
| Rated Insulation Voltage Ui | 690V | 1000V |
| Uimp | 6 kV | 8 kV |
| Mechanical Durability | 15,000,000 ops | 12,000,000 ops |
| MT-32 Frame Size | 40AF | 40AF (MC-32A/40A) / 65AF (MC-50A/65A) |
| Wire Range | 18–10 AWG | 12–8 AWG (MC-32A/40A) |
LS Electric MC B-Series — Frame Comparison
| Model | AC-3 | HP @ 460V | Aux (built-in) | Overload | Replaces |
|---|---|---|---|---|---|
| MC-9B | 9A | 5 HP | 1 NO + 1 NC | MT-32 (40AF) | GMC-9 |
| MC-12B | 12A | 7.5 HP | 1 NO + 1 NC | MT-32 (40AF) | GMC-12 |
| MC-18B | 18A | 10 HP | 1 NO + 1 NC | MT-32 (40AF) | GMC-18 |
| MC-22B (this item) | 22A | 15 HP | 1 NO + 1 NC | MT-32 (40AF) | GMC-22 |
| MC-32A | 32A | 20 HP | 2 NO + 2 NC | MT-32 (40AF) | GMC-32 |
Product Features
- 15 HP at 460V: The MC-22B is rated for 15 HP at 460V three-phase (22A AC-3 / 40A AC-1), suitable for motor starters in pumps, fans, conveyors, and general industrial applications up to 15 HP. It is also rated 20 HP at 575V, 10 HP at 230V, and 7.5 HP at 200V three-phase.
- 1 NO + 1 NC Built-In Auxiliary Contact: The MC-22B ships with one side-mounted auxiliary contact block providing 1 NO + 1 NC. This is the standard B-series configuration for the MC-9B through MC-22B range. The larger A-series contactors (MC-32A and above) include two side-mounted blocks for a total of 2 NO + 2 NC. Additional front-mount auxiliary blocks are available for expanded control wiring needs.
- MT-32 Overload Relay Compatible — 40AF Frame: The MC-22B uses the MT-32 series overload relay at the 40AF frame size, mounting directly to the T1-T2-T3 load terminals. The MT-32/40AF covers the full B-series from MC-9B through MC-22B as well as the MC-32A and MC-40A, making it a single overload relay inventory item for a wide range of motor starter sizes.
- Direct GMC-22 Replacement: LS Electric designates the MC-22B as the manufacturer-recommended replacement for the obsolete GMC-22 series. The MC-22B shares the same dimensions and mounting footprint as the GMC-22, making it a drop-in replacement in existing panels and enclosures.
- Sealed, Finger-Proof Design: The MC-22B B-series uses a sealed enclosure that prevents arc flash exposure and reduces contamination risk in industrial environments. This design distinguishes the Metasol MC series from open-frame contactors.
- High Mechanical Endurance: Rated for 15,000,000 mechanical operations and 2,500,000 electrical operations — exceeding the 12,000,000/2,000,000 ratings of the larger MC-32A/40A A-series. Maximum operating rate is 1,800 cycles per hour under AC-3 duty.
- UL508 Listed: The MC-22B is UL508 listed (File E108780/E206826), CE marked, and RoHS compliant for worldwide industrial motor control applications.
Stock Item – Order before 4:00 PM EST for Same-Day Shipping.
Frequently Asked Questions
How many auxiliary contacts does the MC-22B include?
The MC-22B includes 1 NO + 1 NC auxiliary contact as standard — provided as a single side-mounted block. This is the B-series standard configuration for the MC-9B through MC-22B range. If your application requires more contacts, front-mount auxiliary blocks can be added. Note that the next frame up — the MC-32A — includes 2 NO + 2 NC as standard (two blocks), which may be preferable for applications needing more built-in control circuit flexibility.
Is the MC-22B a replacement for the GMC-22?
Yes — LS Electric designates the MC-22B as the manufacturer-recommended replacement for the obsolete GMC-22 series. The MC-22B maintains the same dimensions and mounting footprint as the GMC-22, making it a direct drop-in replacement. If replacing a GMC-22, order the MC-22B with the matching coil voltage suffix.
What overload relay is compatible with the MC-22B?
The MC-22B is compatible with the LS Electric MT-32 series thermal overload relay, specifically the 40AF frame size. The MT-32/40AF mounts directly to the T1-T2-T3 load terminals of the MC-22B for a complete motor starter assembly. The same MT-32/40AF overload family covers the MC-9B, MC-12B, MC-18B, MC-22B, MC-32A, and MC-40A — making it one overload relay line for a broad range of motor starter sizes. Call Kent Electrical Supply at 1-800-222-5129 for overload selection assistance.
What is the difference between the MC-22B and the MC-32A?
The MC-22B (22A AC-3, 15 HP @ 460V) and MC-32A (32A AC-3, 20 HP @ 460V) are adjacent frames in the LS Electric Metasol series, but they belong to different frame families with different aux contact configurations. The MC-22B is a B-series contactor with 1 NO + 1 NC built-in. The MC-32A is an A-series contactor with 2 NO + 2 NC built-in. Both use the MT-32/40AF overload relay. The MC-32A also has a higher rated insulation voltage (1000V vs 690V) and higher impulse withstand (8 kV vs 6 kV), though the MC-22B has greater mechanical endurance (15M vs 12M ops).
What coil voltages are available for the MC-22B?
The MC-22B is available in 24V AC, 24V DC, 120V AC, 208V AC, 230V AC, 240V AC, and 480V AC coil voltages. The most common US variant is the MC-22B-AC120 (120V AC, 60 Hz). Select the coil voltage that matches your panel’s control circuit voltage. Use the variant selector above or call us at 1-800-222-5129.
Does the MC-22B qualify for same-day shipping?
Yes — stocked MC-22B coil variants ship same business day from Kent Electrical Supply’s warehouse in Emmaus, PA when ordered before 4:00 PM EST. Check individual variant pages for current stock on each coil voltage. For bulk orders or MT-32 overload relays, call us at 1-800-222-5129 or text your RFQ to 484-425-0652.
