Pressure Switches & Pressure Gauges

MERRILL PRESSURE SWITCHES

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Comparison of nine Merrill pressure switch series using nine selection features
Compare Series	STANDARD MPS Medium Use View Product	MANUAL LEVER MPSM1 Manual Lever View Product	LOW PRESSURE CUT-OFF MPSM4 Auto Low Pressure Cut-Off View Product	HEAVY DUTY MPSHD Frequent Use View Product	HEAVY DUTY + LEVER MPSHDM1 Manual Lever View Product	HEAVY DUTY + CUT-OFF MPSHDM4 Auto Low Pressure Cut-Off View Product	EXTRA HEAVY DUTY MPSXHD Heavy Use View Product	EXTRA TALL MPSXHDT Extra Tall Design View Product	CONTROL BOX MCSHD 3-Wire Pump Control View Product
Why Choose It?	Simple, adjustable switch for common residential and standard-duty well systems.	Manual-lever version of MPS for added control at the switch.	Low-pressure cut-off version of MPS for extra pump protection.	Tougher contacts and wire connections for systems that cycle more often.	Manual-lever version of MPSHD for added control at the switch.	Low-pressure cut-off version of MPSHD for extra pump protection.	Higher-capacity, extra-heavy-duty switch with more wiring room and higher-pressure options.	Extra-tall-cover version of MPSXHD for more wiring space.	Combines pressure switching for 3-wire pumps, eliminating the separate control box.
Best For	Typical homes and standard-use systems with standard pump loads.	Same applications as MPS where manual control is preferred.	Same applications as MPS with added low-pressure protection.	Homes, farms and systems where frequent use calls for a more durable switch.	Same applications as MPSHD where manual control is preferred.	Same applications as MPSHD with added low-pressure protection.	Larger pumps, heavier wire, demanding duty cycles and higher-pressure applications.	Same applications as MPSXHD where extra wiring room is needed.	3-wire submersible pumps where simpler wiring and one single control are priorities.
What You Get	Standard two-pole pressure switch; adjustable settings; 1/4 in. female NPT connection.	Same as MPS with a manual lever for on/off control at the switch.	Same as MPS with low-pressure cut-off protection.	Heavy-duty switch with extra-large silver contacts, brass wire connections and capacity for up to No. 8 wire.	Same as MPSHD with a manual lever for on/off control at the switch.	Same as MPSHD with low-pressure cut-off protection.	Extra-heavy-duty switch with large NEMA 1 case, capacity for up to No. 4 wire, conduit knockouts and swivel union.	Same as MPSXHD with extra-tall cover for more wiring space.	MPSXHD-based control switch with run capacitor, swivel union and circuit reset on 1 HP and larger models.
Pressure Range Options	20/40, 30/50, 40/60, 50/70 PSI	20/40, 30/50, 40/60, 50/70 PSI	20/40, 30/50, 40/60, 50/70 PSI	20/40, 30/50, 40/60, 50/70 PSI	20/40, 30/50, 40/60, 60/80 PSI	20/40, 30/50, 40/60, 60/80 PSI	30/50, 40/60, 60/80, 80/100 PSI	30/50, 40/60, 60/80, 80/100 PSI	30/50, 40/60, 60/80 PSI; 3-5 HP tall models: 40/60 or 60/80.
Motor / Electrical Capacity	Up to 2 HP at 230V single-phase; up to 3 HP polyphase.	Up to 2 HP at 230V single-phase; up to 3 HP polyphase.	Up to 2 HP at 230V single-phase; up to 3 HP polyphase.	Up to 2 HP at 230V single-phase; heavy-duty construction for frequent use.	Up to 2 HP at 230V single-phase; heavy-duty construction for frequent use.	Up to 2 HP at 230V single-phase; heavy-duty construction for frequent use.	Up to 3 HP at 230V single-phase; or 5 HP polyphase.	Up to 3 HP at 230V single-phase; or 5 HP polyphase.	1/2 to 5 HP, 230V; control box is matched to motor HP.
Pump / Control-Box Setup	Straightforward choice for 2-wire pumps; 3-wire systems use a separate control box.	Same as MPS.	Same as MPS.	Same basic system setup as MPS, with heavier-duty internals.	Same as MPSHD.	Same as MPSHD.	For higher-capacity systems; 3-wire pumps still use a separate control box.	Same as MPSXHD.	Designed for 3-wire pumps. Replaces traditional control-box components with an integrated control.
Installation & Wiring	1/4 in. female NPT; compact standard case; adjustment guide inside cover.	Same as MPS.	Same as MPS.	1/4 in. female NPT; secure brass terminals; up to No. 8 wire; hex wrench stored in base.	Same as MPSHD.	Same as MPSHD.	1/4 in. swivel union; extra-large case; up to No. 4 wire; conduit knockouts.	Same as MPSXHD with taller cover.	1/4 in. swivel union; extra-large wiring space; color wiring card; extra-tall cover on 3 and 5 HP models.
Special Options	Standard, manual-lever and low-pressure cut-off versions available.	Manual lever.	Auto low-pressure cut-off.	Standard, manual-lever and low-pressure cut-off versions available.	Manual lever.	Auto low-pressure cut-off.	Extra-tall-cover version available when more wiring space is needed.	Extra-tall cover.	Circuit reset on 1 HP and larger models, multiple capacitor sizes for different motor HP.
Key Advantage	Simple, economical replacement for common well systems.	Manual control at the switch for added convenience.	Extra pump protection with low-pressure cut-off.	More durable contacts and terminals without moving to a much larger switch.	Manual control at the switch for added convenience.	Extra pump protection with low-pressure cut-off.	More capacity + more wiring room for demanding installations.	Maximum wiring space with extra-tall cover.	Fewer separate components and simpler 3-wire pump installation (in 1/2 time).
Important Detail	Choose the pressure range your pump can actually reach and pair tank precharge to the cut-in setting.	Match pressure range and tank precharge to your system.	Low-pressure cut-off can add protection, but may nuisance-trip on some high-flow or low-yield systems.	Heavy-duty build improves durability, but the same pressure-range and system-sizing rules still apply.	Match pressure range and tank precharge to your system.	Low-pressure cut-off can add protection, but may nuisance-trip on some high-flow or low-yield systems.	Best fit when higher HP, larger wire or higher pressure justifies the larger case and capacity.	Same as MPSXHD.	Match motor HP and capacitor size; intended for 230V 3-wire pump systems.